Hatred

Devour X, where X is the number of nontoken creatures you sacrifice to activate this ability.

Hatred cannot attack or block unless there are 13 or more creature cards in your graveyard.

When Hatred dies, you may pay life equal to its power. If you do, it deals damage equal to its power to target opponent and each creature they control.
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The obsidian vortex of blood spilt in anger, the crimson maelstrom of primal agony and unquenchable fury.