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Yuffie Kisaragi is a 1/3 Human Ninja Creature with Commander ninjutsu, and whenever a Ninja you control deals combat damage, Yuffie allows you to reveal the top card of your library and put that card into your hand

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If, during a player's declare attackers step, a creature that player controls that's been goaded is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under that player's control continuously since the turn began (and doesn't have haste), then it doesn't attack

Its actually quite simple, and all you need is to grow Korvold by simply sacrificing some tokens and making it unblockable for a single lethal attack