mtg blue search your library for a card Rules Text: search, target, player's, library, exile, 21 cards then shuffle your library c!u o:"search your library for"

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

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

A Sultai value commander like Glarb, Calamity's Augur is probably a good shout

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

This is a great option for those curious about MTG but looking for a lower budget option

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