The Nautilus

Whenever one or more creatures crew The Nautilus, put that many cards from the top of your library into your graveyard.
Defile 5 — Whenever five cards are put into your graveyard from anywhere, if The Nautilus isn't defiled, it becomes defiled and put three +1/+1 counters on it. As long as it's defiled, it can't be blocked.
Crew 5