Flock of the Feather Walkers (Yellow) (History Pack 1)

As an additional cost to play Flock of the Feather Walkers, reveal a card in your hand with cost 1 or less. When you attack with Flock of the Feather Walkers, create a Quicken aura token. (It's an aura with "When you play an attack action card or attack with a weapon, destroy Quicken and the attack gains go again.")