Simic Fleetswallower

Simic Fleetswallower enters the battlefield with X 1/1 counters on it.
Trample
Whenever Simic Fleetswallower attacks, defending player puts the top X cards of his or her library into his or her graveyard where X is Simic Fleetswallowers' power.
" It's on the starboard, no the bow, no the stern, no, It's Beneath Us!"