Damage Assessment

Enchant creature or planeswalker; if Damage Assessment was kicked, enchant player instead.
Kicker {1}{w}{u} (You may pay an additional {1}{w}{u} as you cast this spell.)
When enchanted creature, planeswalker, or player takes damage, investigate. (Put a colorless Clue artifact token onto the battlefield with "{2}, Sacrifice this artifact: Draw a card.")
Aura swap {2}{w/u} ({2}{w/u}: Exchange this Aura with an Aura card in your hand.)