Merfolk Gatekeeper

Hexproof
Whenever a creature you control blocks, you may return that creature and each creature it blocked
to its owner's hand.
Stalk—Exile two Island cards from your hand
(At the end of each block step, if there is an unblocked creature attacking you, you may cast this card for its
stalk cost. If you do, choose an unblocked creature attacking you. This creature blocks that creature.)