Skaagzi's Decoy

(Skaagzi's Decoy is red.)
If you control a creature named Skaagzi, Scrap
Bandit, you may cast Skaagzi's Decoy from your graveyard.
{x}, {t}, Sacrifice another artifact: Put X +1/+1 counters on target artifact creature you control,
where X is the sacrificed artifact's converted
mana cost. Activate this ability only any time you
could cast a sorcery.