Priceless Discovery

For each {r} payed to cast this spell, discard a
card, then draw a card.
If only red mana was spent to cast this spell,
Priceless Discovery deals 5 damage to any target.
For each {w} spent to cast this spell, return target
card from your graveyard to your hand.
If only white mana was spent to cast this spell,
you gain 5 life.