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 mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery.
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Fiend Artisan may become lethal if creature cards leave your graveyard during that turn.
Fiend Artisan’s first ability applies only while it’s on the battlefield.
If a card in a player’s library has {X} in its mana cost, X is considered to be 0.