Pendant of Trickery

Whenever equipped creature deals combat
damage to a player, if there were no blockers
declared this combat, You may pay
{2}{u}. If you do exile the top card from the
library. You may look at and cast that card
for as long as it remains exiled, and you may
spend mana as though it were mana of any
type to cast that spell.
Equip {3}