talent cards mtg 401 Games Canada - Teferi's At the beginning of combat on your turn Magic the Gathering Bloomburrow Rare

Two immediate options that come to mind are Jodah, Archmage Eternal, which basically lets you cast this for WUBRG and then net yourself 5 mana to help cast the spells you reveal, and Mizzix of the Izmagnus, which can cast this 10cmc spell for as low as RRR

A mutated creature is considered a merged permanent, a designation unique to mutate

There are some funny scenarios where this ends the game in a draw, since neither enchantments trigger is optional

Having looked at their site and done some quick conversion math, their prices on sealed products are also excellent (and props to them for having the yen to dollar conversion rate on all their pages)