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Hall of Mirrors

Visit — Choose target creature you control. Each other creature you control becomes a copy of that creature until end of turn, except it isn't legendary.

Unfinity

"Finally! Something that can capture all my good angles."
—Captain Rex Nebula

Hall of Mirrors affects only creatures you control at the time its ability resolves. Creatures that come under your control later in the turn won’t be copies of the chosen creature.

Hall of Mirrors copies the printed values of the target creature. It won’t copy any counters or stickers on that creature or any effects that have changed its power, toughness, types, color, and so on, and a creature becoming a copy doesn’t remove any such counters or effects that are already applying to it. Notably, Hall of Mirrors won’t copy any type-changing effects that are currently making the target a creature. For example, if you choose a land that’s become a creature, all your other creatures will become noncreature lands until end of turn.

If the chosen creature is copying something else, other creatures you control become copies of whatever the chosen creature is copying.

If the target creature is a token, other creatures you control will copy the original characteristics of that token as stated by the effect that created the token. Any of those creatures that aren’t tokens won’t become tokens in this case. Similarly, if the target creature is a nontoken creature, creature tokens you control won’t stop being tokens.