Hareal, Web's Bounty

: Whenever you attack with creatures, tap each creature with a -1/-1 counter on it.
+2: Untap target tapped creature you don't control. Put a -1/-1 counter on it.
-8: Tap all creatures. Put two -1/-1 counters on each creature. Each opponent loses life equal to the number of -1/-1 counters among all creatures.