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: Simic Keyrune becomes a 2/3 green and blue Crab artifact creature with hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)
Until the ability that turns the Keyrune into a creature resolves, the Keyrune is colorless.
Activating the ability that turns the Keyrune into a creature while itâ€™s already a creature will override any effects that set its power and/or toughness to another number, but effects that modify power and/or toughness without directly setting them will still apply.