Baron Von Railwoch

Whenever a creature enters the battlefield under your control, you may put a -1/-1 counter on it.
Baron Von Railwoch gets +1/+1 for each -1/-1 counter on other creatures you control.
{1}{b}: Put a -1/-1 counter on target creature.
Remove 2 -1/-1 counters from target creature you control: Regenerate that creature. You gain 1 life.