At the start of the Damage Step, if your "U.A." monster battles an opponent's monster: You can banish that opponent's monster until your opponent's 2nd End Phase. You can only use this effect of "U.A. Penalty Box" once per turn. You can banish this card from your Graveyard; add 1 "U.A." Spell Card from your Deck to your hand.
All your U.A. monsters can banish your opponent’s monsters during the start of Damage Step, the banish monster will return to the Field during the end of your opponent’s 2nd End Phase.
Can be banished from your Graveyard, to search for any U.A. Spell card from your Deck.
Cons
Continuous Trap Card potentially clog your backrow.
Tips
Archetype Monsters
These are the U.A. monsters that can benefit from U.A. Penalty Box effect that banishes opponent’s monsters during the start of Damage Step.
It's way worse than onslaught, guys. Onslaught is searchable by princess making it consistent, can banish multiple per turn, and permanently, special summons from the hand with boost, and special summons on destruction. Not even close.
Use with grass looks greener to get a free search, there is no restriction to the graveyard effect so you can use it NOW. Not tommorow, not after brrakfast, NOW. You can even use Double cyclone or storm to get some more value too
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