Jackol, Chemical Emperor

+1: Put a chemical counter in the target creature. Until your next turn, it gets -1/-1. You lose 1 life.
+1: Create a */* black and green Horror creature token with "Power and thoughness are equal to the number of creatures with a chemical counter".
-7: Destroy all creatures with a chemical counter. For each creature types destroyed this way, draw a card and gain 1 life.