Scorpius Rex, the First Hybrid

Menace, Infect
Enrage — Whenever Scorpius Rex, the First Hybrid is dealt damage, choose an opponent at random. Scorpius Rex deals damage equal to its power to that player unless they sacrifice a nontoken creature.
"The Scorpios rex's mind has turned out to be as fragmented and unpredictable as its body"
—Dr.Henry Wu