Sandworm Abomination

Hidden (Whenever a creature an opponent controls
attacks you or a planeswalker you control, if this card
is face down, you may turn it face up.)

Morph {1}{w} (You may cast this card face down
as a 2/2 creature for {3}. Turn it face up any time
for its morph cost.)

When Sandworm Abomination is turned face
up, you may return target creature an opponent
controls to its owner's hand.