KMS Z23

Whenever you cast an instant or sorcery spell, KMS
Z23 gets +1/+0 until end of turn. If that spell dealt damage, put a +1/+1 counter on KMS Z23 instead.

{r}, {t}: Exile an instant or sorcery card from your graveyard. You may cast it this turn.

“There's still quite a lot to be done today. No procrastinating!”