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Ashcloud Phoenix is great in any deck built around those types of mechanics, because unlike most Morph creatures it can go back and forth between being face up and face down

For example, say you've cast two spells this turn, and with Murmuration's last ability on the stack, you cast a Blizzard Strix (a Bird creature spell with flash that may have been chosen for this example due to being an adorable owl)

But what other features can you rely on

For the most part, though, Crucible of Worlds is limited to Commander

Commander Kardur, Doomscourge When Kardur enters, until your next turn, creatures your opponents control attack each combat if able and attack a player other than you if able

EvokeCelebrate an opponent