You may have Body Double enter the battlefield as a copy of any creature card in a graveyard.

Flash (You may cast this spell any time you could cast an instant.) Whenever you cast a spell during an opponent's turn, put a +1/+1 counter on Brineborn Cutthroat.

Flash Flying When Draining Whelk enters the battlefield, counter target spell. Put X +1/+1 counters on Draining Whelk, where X is that spell's mana value.

Defender, flying Prevent all combat damage that would be dealt to and dealt by Fog Bank.

When Man-o'-War enters the battlefield, return target creature to its owner's hand.

Counter target spell.

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Scry 1. Draw a card.