KAY/O, War Machine

Affinity for Artifacts (This spell costs {1} less to cast for each artifact you control)

Whenever you cast your first artifact spell each turn, you may put a suppression counter on target creature an opponent controls. (If a creature with a suppression counter on it would attack, it gets -2/-0 and loses all abilities until end of turn)

Whenever one or more creatures with a suppression counter on it attacks, draw a card, then you may put an artifact card from your hand onto the battlef