Imskir Iron-Eater - Legendary

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.) When Imskir Iron-Eater enters the battlefield, you draw X cards and you lose X life, where X is half the number of artifacts you control, rounded down. {3}{R}, Sacrifice an artifact: Imskir deals damage equal to the sacrificed artifact's mana value to any target.