Wistfulness
Creature — Elemental Incarnation
Rarity
Mythic
Mana Cost
Artist
Jesper Ejsing
Power / Toughness
6 / 5
Oracle Text
When this creature enters, if
was spent to cast it, exile target artifact or enchantment an opponent controls.
When this creature enters, if 
was spent to cast it, draw two cards, then discard a card.
Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)
Rules for this card
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A keyword ability that causes a permanent to be sacrificed when it enters the battlefield. See rule 702.74, “Evoke.”
Rulings (5)
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Wizards of the CoastWistfulness's first and second abilities care about what mana was spent to pay its total cost, not just what mana was spent to pay the hybrid mana symbols in its cost.
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Wizards of the CoastTo determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as an evoke cost), add any cost increases, then apply any cost reductions. The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.
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Wizards of the CoastIf you pay the evoke cost, you can have the creature's own triggered ability or abilities resolve before the evoke triggered ability. You can cast spells after that ability resolves but before you have to sacrifice the creature.
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Wizards of the CoastIf this spell is copied, the copy will not have had any colors of mana paid for it, no matter what colors were spent on the original spell.
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Wizards of the CoastWistfulness's first and second abilities check to see if at least two mana of the appropriate colors were spent to pay Wistfulness's cost. It doesn't matter if more than two mana of that color was spent; the effect isn't multiplied.