Notes
I will explain the cards but if you wish for more in-depth information, go to https://www.carddass.com/dbh/sdbh_ugm/cardlist/ with a translate add on or utility, can copy the card text and paste it to google translate if you're an unsophisticated ningen. And Dimpsu, if you are reading this, pls WM2, I need the localized goodies so I don't have to cry on not letting my deck building autism flow, and you know that you can make it a masterpiece, H1 -> UGM5. Also for possible card choices, this won't be 100% complete, hundreds to thousands of combos, just the initial ones that came to my mind that I thought were noteworthy. Also i won't touch apps too much if at all for these deck techs because they're not in my wheel-house, best I can say is use what feels right, PWR LV Limiter on R2/3, maybe Ultra God App if you wounded Vegito (Xeno), there's a missile app for R4/5 that deals 20k damage that you could try to stall towards, won a finals match on stream.
Core
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UGM5-023 Trunks (Future) AND BM11-SEC Gogeta (Xeno)
So Trunks (Future) has the EL crew target the enemy that takes the most damage and then if he wins the CI, make them take 2x damage (4x if perfect), Gogeta (Xeno) does the same thing alongside some HE destruction, so if these two win a co-op CI, that enemy is taking 4x times damage, and it's EL, so UGM1-SEC2 isn't much of a problem. The targeting on here shouldn't matter because the Demon God HA overwrites them both. The CAAs aren't half bad, especially on Gogeta (Xeno), who gives him and his partner 2x DMG and 50% DMG reduction. If there's one thing to note with this deck in general, it is very susceptible to a block burst since it has a lot of 'on attack' triggers, so if they are blocked, they won't proc.
BS Demon God HA AND UGM5-SEC Gohan (SH)/Piccolo (SH) AND UM9-033 Pan (Xeno)
Demon God HA has it where the team will target the enemy with the lowest GRD if you have 6k PWR LV, which on its own is pretty easy, with our friend UGM5-SEC Piccolo (SH) however it becomes absolutely trivial, he gives you 1.5k PWR LV per enemy attacker, and this does generate HE, and when attacking, his co-op group gets 2x PWR and PWR LV and STA generation (1 bar which isn't great), Pan (Xeno) is here just for extra style and STA generation, she generates 2 bars of STA for her co-op group, the capsule can increase enemy CI and disable miracle perfects if it lands on them. Gohan (SH) has it where he is unable to be in a co-op attack but he deals fixed damage if the enemy has supporters, 2.5k per supporter and if they have 30% or more DMG reduction, he deals 5x damage, does have a funny interaction with DMG reduction pierce where he gains the 5x dmg despite ignoring the DMG reduction of the enemy, but probably doesn't matter with all the DMG reduction shredding I think. Main goal here is that UGM5-SEC stays as Piccolo (SH) for the massive speed he can offer.
the Sixth and Seventh Slot
So the seventh slot is a bit of a filler slot depending on what you want/need, or what card you want to tell to piss off.
BM3-SEC3 Gogeta (EL)
So this card has it where he increases the enemy's CI speed for his co-op attack and make them take 1.5x damage, not bad but that is about all this card does, he does limit enemy attack damage to 3k if they attack him while having less power and not being in a co-op attack, unlikely, his blitz increases the enemy's CI speed as well as lower their PWR by 20k, but the targeting might be random, don't know how long the Demon God HA's targeting lasts. Still, being able to increase the enemy's CI speed can make it much easier to win the CI for the EL Co-Op Group, and thus shred the enemy, also brings extra damage on his own.
UGM5-SEC3 Vegito (EL)
When this card is Super Vegito, he gains 2.5x DMG, PWR, and GRD, 3 HE for the whole team, and a burst when using his super attack. When he attacks he reduces the enemy co-op group's PWR/GRD by 5k, which isn't bad, and makes the enemy take 1.5x DMG permanently, so if you simply win, the enemy is taking 6x DMG by the next co-op group, perfect win it balloons into 24x DMG taken, note that UM11-SEC is a fast CI so he may not be the most agreeable CI to win with. Of course, proper GRD shredding is nice.
UGM5-SEC2 Aeos (HR)
Obligatory BM7-SEC/UGM1-SEC2/UGM5-ASEC answer, though this one can do more than that, note that lock-ons have max attack priority so she can make sure the enemy shenanigans are disabled for your attack before your EL/BS co-op group can feast against a field of disabled cripples.
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UGM4-064 Gohan (SH) (EL) OR BM11-017 Goku (EL)
The stun option against STA generation/BM7-SEC, the main problem for Gohan (SH) is that the EL co-op group is intending to do damage, so he may not do too much STA damage or HE generation, BM11-017 Goku increases enemy CI speed, which is nice alongside a fixed amount of STA damage as long as you can match his 11k PWR LV requirement, which if you're disabled under the Aeos Core and their unit, may prove to be difficult.
UGM2-065 Piccolo (SH) (EL)
More stable STA generation option when compared to UM9-033 Pan (Xeno), problem is that UGM5-SEC is meant to be Piccolo (SH) so you may need another Gohan (SH) card like UGM3-SEC, UGM4-064 or UGM2-064.
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HJ6-063 Trunks (Xeno) (EL) OR BM11-SEC3 Goku (EL)
So this is here to help with piercing GRD, Trunks (Xeno) sets the enemy's GRD to 1 if you win the PLBP but Goku does a good deal more, Goku halves the enemy's PWR LV R1, then when he becomes SS3 (gaining 4x DMG and PWR), he reduces his DMG dealt by 30% at the end of the attack but makes the enemy have their GRD permanently disabled. This just helps let the DMG reduction shredding stick even more as GRD won't be able to mitigate it, problem with using other options can be if they disable DMG reduction, meaning our attempts to make them as frail as paper is all undone.
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BM11-070 Vegeta (HR) AND PUMS12-SEC Goku (BS) OR UM3-038 Goku (BS)
When BM11-070 Vegeta is a supporter, he gains 3k PWR LV and fixed damage, and it's probably best to do it once, if you win the PLBP he sets his PWR to the enemy's highest PWR, he also comes with a powerful PWR LV Limiter unit that requires 2 HE and is free, but requires Goku and Trunks (Future), UGM5-023 Trunks (Future) comes with a PWR LV Limiter unit that for 4 HE, the enemy is capped to 5k PWR LV and has increased CI speed, but requires Vegeta and Goku (all unit members generic thankfully), so with UGM5-023 Trunks (Future), BM11-070 Vegeta, and any Goku, you get 2 PWR LV Limiter Units, which can help win R2/3 because you're not meant to be defensive really. As for the Gokus, while BM11-SEC3 and BM11-017 are fine picks, there's two others I'd wish to mention since of UGM1-SEC Aeos, she disables enemy fixed PWR LV if she has more HE than the enemy when she restores her STA, with UGM1 Piccolo-in-Black, she will, unless you disable her gaining HE from abilities which is where PUMS12-SEC and UM3-038 come to play. UM3-038 is simple, he'll never fuse, but he makes sure that at the end of R1, the enemy has 0 HE because he also disables HE from PWR LV. PUMS12-SEC however allows the enemy to have up to 2 HE from PWR LV alongside none from abilities but comes with 3x PWR/GRD, and 3k PWR LV alongside a the team CAA that gives himself and 4 partners 3k PWR.
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BM11-058 Goku (Xeno) (EL) AND BM11-060 Vegeta (Xeno) (BS) OR PBBS11-05 Vegeta (Xeno) (BS) OR PCS17-01 Vegeta (Xeno) (HR) OR BM6-056 Vegeta (Xeno) (BS)
So BM11-058 Goku (Xeno) also disables enemy generation from abilities and protects your HE from destruction R1 before fusing into SS4LB Gogeta (Xeno), where he offers 3 HE every round alongside quadrupling his PWR. Also as a fusion, he as adding some speed to the EL co-op group. Now for the Vegeta (Xeno), half a dozen options but you want some one-shot throwaway so that you won't miss him when he becomes a part of Gogeta (Xeno), and he has to be SS4LB to fuse with Goku (Xeno). BM11-060 Vegeta (Xeno) offers a nice stun on the enemy team, reducing their STA and halving their PWR LV though it can be punished with an Aeos Core unit activation. PBBS11-05 gives you possible HE theft and a wall burst, so you may not die at R1 since we lack actual defense. PCS17-01 has Battle Pride, and with disabling HE from abilities alongside your Speed he can easily boost your team's PWR by some amount before fusing off to BM11-058 Goku (Xeno), and finally, BM6-056 Vegeta (Xeno), in case you wanted to fuse off Goku (Xeno) instead. What he does is that if you have 3 or more HE than the enemy, he'll have the enemy take 1.3x DMG (probably raised to 1.5x if he's fused), and when he fuses into SS4LB Vegito (Xeno), when winning a CI he deals 500 fixed damage per HE you have on your team, 1k if it's a perfect win, also being a BS means he can go well with Piccolo (SH) and join the pain train.
Deck
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BM11-058 Goku (Xeno) AND BM6-056 Vegeta (Xeno)
You're probably more reasonable to go with BM11-070 Vegeta and one of the anti HE generation Gokus (PUMS12-SEC is my preference since the CAA I think also is affected by the reduced enemy DMG reduction so in case you're bad at some CIs) because of the two PWR LV Limiters you get alongside some possible fixed damage and a HR attacker, but you're telling me I could have SS4LB Vegito (Xeno) FUSED INTO, SS4LB Gogeta (Xeno), and Orange Piccolo, all into a team, and it to have some form of synergy? Sign me up, let's give these orphaned cards a fucking home.
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UGM5-023 Trunks (Future) AND BM11-SEC Gogeta (Xeno) AND BS Demon God HA AND UGM5-SEC Gohan (SH)/Piccolo (SH) AND UM9-033 Pan (Xeno)
The Core section speaks for itself, if I were to note one thing, this is probably one of the harder decks to play since you just need to win CIs for the EL part to do anything, while the BS side doesn't prop-up much in the way of overwhelming DMG, but it's fine when the enemy is taking a bajillion times the normal damage.