mtg blue search your library for a card Rules Text: search, target, player's, library, exile, 21 cards you may search your library for an instant or sorcery card with converted mana cost 2 or less For One Mana - Blue

Given that Merfolk go wide with creatures, a free counter spell at the cost of one lowly Merfolk can be game-saving and/or game-winning

My experiences playing the deck were a blast and it was Miara who led the charge

They serve to give your side of the board tempo by allowing your creatures to attack (removing defenders), giving you more time to set up the board (removing attackers/expensive creatures), and allow for combat tricks (saving your creatures after damage is on the stack

None of these seem very strong, plus theres the chance you mill over the perfect tutor target at some point

Norn's Choirmaster gives your Incubator tokens another buff with frequent proliferation

There are other similar mono-color rocks in this semi cycle, but these are the best