Restless Reef (Promo Pack) [The Lost Caverns of Ixalan Promos]

Restless Reef enters the battlefield tapped.

T: Add U or B.

2UB: 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.