Fiend Artisan [Ikoria: Lair of Behemoths Prerelease Promos]

Fiend Artisan gets +1/+1 for each creature card in your graveyard.
{X}{B/G}, {T}, Sacrifice another creature: Search your library for a creature card with converted mana cost X or less, put it onto the battlefield, then shuffle your library. Activate this ability only any time you could cast a sorcery.