There are some fun new toys coming out in
Morningtide that my Merfolk deck will enjoy:
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Stonybrook Schoolmaster
2W
Creature - Merfolk Wizard
1/2
Whenever Stonybrook Schoolmaster becomes tapped, you may put a 1/1 blue Merfolk Wizard creature token into play.
Merrow schools rarely form by design. They come together naturally as eager learners surround the wisest teachers.--
Grimoire Thief
UU
Creature - Merfolk Rogue
2/2
Whenever Grimoire Thief becomes tapped, remove the top three cards of target opponent's library from the game face down.
You may look at cards removed from the game with Grimoire Thief.
(U), Sacrifice Grimoire Thief: Turn all cards removed from the game with Grimoire Thief face up. Counter all spells with those names.
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Ink Dissolver
1U
Creature - Merfolk Wizard
2/1
Kinship - At the beginning of your upkeep, you may look at the top card of your library. If it shares a creature type with Ink Dissolver you may reveal it. If you do, each opponent puts the top three cards of his or her library into his or her graveyard.
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Stonybrook Banneret
1U
Creature - Merfolk Wizard
1/1
Islandwalk
Merfolk spells and Wizard spells you play cost less to play.
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Door of Destinies
4
Artifact
As Door of Destinies comes into play, choose a creature type.
Whenever you play a spell of the chosen type, put a charge counter on Door of Destinies.
Creatures you control of the chosen type get +1/+1 for each charge counter on Door of Destinies.