Notes & Combos
The combo: A monster on your side of the field + Nightmare Archfiends set; Transaction Rollback + Earthbound Release on the graveyard. Activate Nightmare Archfiends by tributing the monster, special summon the 3 tokens on your opponent's side of the field, activate Transaction Rollback targeting Earthbound Release. This will destroy the 3 tokens and deal 6k damage + each token deals 800 damage when destroyed for a total of 8400 damage.
This can go wrong in a lot of ways, specially if your opponent goes first and summons 3+ monsters in the main monster zone. I had a lot of success against Ice Barrier because you can activate Transaction Rollback targeting Earthbound Release if they summon a level 6 or higher monster, but Icejade Gymir Aegerine or Transaction Rollback getting negated is straight up a loss.
Also, play 3 Transaction Rollbacks, I didn't have a 3rd copy and wasn't going to spend my CP UR on it just to troll on the event.