Zoya, fullmetal mechanic

vigilance, haste, first strike
whenever another artifact creature enters the battlefield under your control, put a circuit
counter on Zoya.
Artifact creatures you control get +X/+X, where
X is the number of circuit counters on Zoya
minus three.
if there are six or more circuit counters on Zoya, artifact creatures you control have haste.
whenever you cast an artifact card, draw a card.