Sigil of Acid

Necro {1}(When you cast this spell, you may remove
a creature card with {1} in its casting cost from your graveyard. If you do, this spell costs {1} less to cast.)
Black creatures you control gain "Whenever this creature deals combat damage to a player, put an
Acid counter on target artifact." Artifacts with an Acid counter deal 1 damage to their controller for each
Acid counter at the beginning of their upkeep.
Draw a card.