War of Elements

If {w} was paid to cast this spell, you gain 3 life.
If {u} was paid to cast this spell, draw 3 cards,
discard a card.
If {b} was paid to cast this spell, target opponent
discards 2 cards, and loses 2 life.
If {r} was paid to cast this spell, War of Elements
deals 3 damage to target creature.