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it also lets you use auras and provides your creatures with extra keywords

it lets you play both black Werewolves, as well as white effects like Rule of Law and Deafening Silence

I am not sure it will displace another card in that deck in Modern, for example, because the Merfolk Modern deck is packed with lords at three mana

Dropping the Devils Egg at your opponents site makes them the new controller of the artifact

Aurora, Regal Princess x3 Aurora, Briar Rose x3 Aurora, Dreaming Guardian x1 Flounder, Voice of Reason x2 Gramma Tala, Storyteller x2 Jasmine, Disguised x2 Maleficent, Sinister Visitor x3 Maleficent, Uninvited x1 Mickey Mouse, Detective x3 Mufasa, King of the Pride Lands x2 Scar, Mastermind x1 Develop Your Brain x3 One Jump Ahead x2 Coconut Basket x3 Magic Golden Flower x2 Beast, Hardheaded x2 Cpatain Hook, Forceful Duelist x3 Goons, Maleficents Underlings x2 Hercules, True Hero x2 Kristoff, Official Ice Master x2 Maui, Demigod x1 Prince Eric, Dashing and Brave x2 Simba, Rightful Heir x2 Simba, Returned King x1 Fire the Cannons x2 Grab Your Sword x1 Ransack x2 Smash x2 Frying Pan x2

My main issue is the cost of mutate is too high, as youll be sacrificing one of your creatures to plop a mutate creature onto it