Thank you for letting me know! This is the second (possibly third) infinite that's been found with Frantic Phantom, actually, so I already had an errata for it:
Once during this turn, you can use any Unique Action you know, from among all your Styles and Forms. You must still pay its Cost.
Your Unique Actions have their cost reduced by 1 (to a minimum of 1+ or 2 tokens) during this turn.
As so many have said before me: This game is incredible! As a Magic player, I get the same feeling I get from deck building, as a TTRPG! Hosting games soon =)
To add to the Infinite topic: Fused Phantom + Elder Style + Song Form can Sing Along to give itself a 4 Action Die, and loop the song for infinite Basic Tokens for themselves and their team.
Just like in MtG, cost reductions can be abused, haha!
