Peri, Death Incarnate

+1: Target Creature gains "Critical Strike" Until end of turn "Roll a 20 sided Die, If 10 or higher, kill creature or deal double damage at instant"
+4: Sacrificial target creature you control, and take 4 points of damage
-10: If loyalty counter was at 10,then summon 5 1/1 Human Creatures with Haste All creatures you control gain "True Critical Strike" until end of turn