The cost required to cast your Summons can be paid with CP of any Element.
When Yuna enters the field, you may pay {w}{w}{w}{2}. When you do so, search for up to 6 Summons, each of a different Element and cost and add them to your hand.
%Doublecast% {s}: When you cast a Summon this turn, you may cast 1 Summon from your hand with a cost inferior to that of the Summon you cast without paying its cost.