Jack, Iron Eradication

First strike, menace
{4}, {t}: Put X +1/+1 counters on target
noncreature artifact you control, where X is that
artifact's converted mana cost. It becomes a 0/0
artifact creature with haste and vigilance.
{b}{r}, Sacrifice an artifact: Jack deals X damage
to any target, where X is the sacrificed artifact's
converted mana cost.