Restless Reef (PLCI-349S) - The Lost Caverns of Ixalan Promos (Borderless) Foil

Restless Reef enters the battlefield tapped.
: Add or .
{2}: Until end of turn, Restless Reef becomes a 4/4 blue and black Shark creature with deathtouch. It's still a land.
Whenever Restless Reef attacks, target player mills four cards.