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During your Main Phase: You can reveal 1 Spellcaster monster from your hand, add 1 monster with the same Attribute but with 1500 ATK/200 DEF, from your Deck to your hand, and if you do, shuffle the revealed card into the Deck

How to Get Gigantamax Corviknight You can find Gigantamax Corviknight through Max Raid Battles

Trading card Game

But if you can set that up, the free tempo swing you can potentially generate with every hit is incredibly dangerous not least because setting your opponent back on board often snowballs into further successful hits

I think it's probably the gen 9 favorite other than maybe the starter or box legendaries

Set 1 Quick-Play Spell directly from your Deck