Sevel, Assassin Apex

: Whenever you gain life, put that many loyalty counters on Sevel. Whenever a creature dies, each opponent loses 2 life, and you gain 2 life.
0: Create two 1/1 black assassin creature tokens with Haste, Deathtouch, and Lifelink.
-3: Choose a creature. At the beginning of your upkeep, destroy that creature if Sevel is in play, if not, return Sevel to your hand.