Overall, the Extra Zero Festival is poorly timed, similar to the Fusion Festival
You want to make sure Cloud's power is getting boosted to at least seven so you can create Treasure tokens
(Thats one way to Special Summon your non-pawn chessmen.) If a chessman Monster Card you control is destroyed (even if its in the Spell & Trap Zone), the chessboard Field Spell lets you return any chessman in your Spell & Trap Zone to the Extra Deck, then immediately Special Summon it
These can then be used to crew all of your Vehicles, turning 1/1s into massive threats
Youve seen this before, though the twist here is that the deck cares more about discard synergy and creating tokens than it does about sacrifice, like the Undead Unleashed deck from Midnight Hunt Commander
Yes, significant compliance risks exist