By the way, I'll be disappointed if Siero isn't among the legendary creatures.
The protagonist should get two skins (like some cards, such as the quickblader, already have). And the mechanic could be: "when playing this card, choose one of ten options."
And yes. Where is our beloved flying, talking lizard? Or will he be given the role of a new, quirky mascot, like Kotov, the cheerful Swintus, Hamsa, etc.?