Jenn, the Common

+1: Jenn sleeps. Whenever an opponent casts a spell while Jenn sleeps, roll a D20. 1-19: nothing happens. 20: Jenn screeches. Destroy all creatures
-2: Summon two 2/2 wolf creature tokens with "Tap, destroy target artifact, rodent, or leg"
-10: Transform Jenn the Common to Jenn the Mythic, a 10/10 Unicorn with trample, indestructible, vigilance, and sass.