msem-instigator

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever an opponent loses 3 or more life, add a quest counter.
1 — Destroy up to one target creature with power or toughness 2 or less.
2 — Create Sir Jasper Reborn, a legendary 3/1 black Zombie Mouse Knight creature token with menace.
3 — Search your library for a card, reveal it, put it into your hand, then shuffle. If you revealed a card named Karoa's Downfall this way, you may cast it without paying its mana cost.