Wormwood Fallstar

Wormwood enters the battlefield with five +1/+1 counters on it.
Remove a +1/+1 counter from Wormwood: Put a -1/-1 counter on each other creature.
"The third angel sounded his trumpet, and a great star, blazing like a torch, fell from the sky on a third of the rivers and on the springs of water-the name of the star is Wormwood. A third of the waters turned bitter, and many people died from the waters that had become bitter." -Revelations 8:10-11