Batrashark

Devour 1.
When Batrashark enters the Battlefield, Scry X, where X is the number of creatures you sacrificed this turn.
{u}{u}: Batrashark gains Flying until end of turn.
At the end of your Ending phase, return Batrashark to owner's hand.
"Knowledge has a price. Your left arm, for example"
-The Batrashark