What are the abilities of Selvala, Eager Trailblazer?
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Vigilance\nWhenever you cast a creature spell, create a 1/1 red Mercenary creature token with "{T}: Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery."\n{T}: Choose a color. Add one mana of that color for each different power among creatures you control.
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