Califax and Jesray

Flying, trample, haste
Dragons you control cost {1} less to cast for
each contract you pay. (Contracts: Discard a card,
pay 2 life, and/or sacrifice a creature.)
Whenever you pay a contract to cast a dragon,
take 3 damage. It gains haste until end of turn.
Attacking dragons you control get +1/+0 for each contract you paid this turn