To the west, there rose Niflheiman imperial war-machine driven by superior technology and the arcane might of magitek
(Character cards have to wait a turn before taking an action, but the other card types come right into the action.) When sung by the appropriate charactercurrently tied to the cost/value of the singing character)these Song cards enter the game at no cost
Now how about this lore from the release announcement
Functionally, Yuna's Whistle is a pseudo-cantrip that always replaces itself with a creature, and finding the creature gives you some +1/+1 counters too, so there's combat trick potential as well
This cost-four card has two strength and four willpower and is centered in a scandalous, pseudo-infinite, all thanks to his ability
This elegant loop has made him one of the most valuable and sought-after cards in the release