Imskir Iron-Eater (MH3-431) - Modern Horizons 3

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