Bully Bill, Endarth's Foremost

Creatures under your control get +1/+1 for each bounty counter on creatures your opponents
control.
{t}: Put a Bounty Counter on a target opponents' creature.
—
"Listen very well, McCartney. It's not so hard to
understand. You help us and we'll protect you...
protect you from what, you ask? Well, of that little
thing we'd do to you if you don't help us"