Garbster

When a player sacrifices a permanent,
put a +1/+1 counter on Garbster.
When you exile a card from an opponent's library,
you may pay {1}. If you do, choose one at random:
• Put a +1/+1 counter on
Garbster.
• Remove X counters from
Garbster then destroy target
creature with converted mana cost X.