Fiend Artisan
From Ikoria: Lair of Behemoths set
Fiend Artisan
Creature — Nightmare
1/1
This creature gets +1/+1 for each creature card in your graveyard.
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, Sacrifice another creature: Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery.