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It's an engine which, senior game designer Carmen Klomparens writes in the announcement article, "is hard to profitably interact with"

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They read, Whenever an opponent sacrifices a nontoken permanent or discards a permanent card, you may put that card from a graveyard onto the battlefield under your control. That means you can attack in multiple ways, and as long as youre interfering with your opponents hand and board state, youll benefit massively from it

A little later, we will tell you how to build an effective deck for the game

Totally a thing

In Colorless, aside from incidental damage from blocking, there isn't a ton if way to deal damage with this on its own