Vibrance
Creature — Elemental Incarnation
Oracle Text
When this creature enters, if
was spent to cast it, this creature deals 3 damage to any target.
When this creature enters, if 
was spent to cast it, search your library for a land card, reveal it, put it into your hand, then shuffle. You gain 2 life.
Evoke 
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 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 CoastVibrance's first and second abilities check to see if at least two mana of the appropriate colors were spent to pay Vibrance's cost. It doesn't matter if more than two mana of that color was spent; the effect isn't multiplied.
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Wizards of the CoastVibrance'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 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 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.