Yonah, Diseased Assassin

: Whenever a creature deals damage to Yonah, Diseased Assassin it's controller sacrifices that creature at end of combat
+2: Create a 1/1 black assassin creature token with Toxic 1 and "this creature can't block or be blocked"
-10: Each opponent gains 7 poison counters, destroy all planeswalkers. you get an emblem with "you may cast planeswalkers from all graveyards".