The first of these cooperative battlers is subtitled Deep Trouble, and it seems as though we can expect a series of these PvE-style releases in future sets
Build for a curve : The same can be said when adjusting your first hand, you should try to spread your card ink costs out, so that you have something to summon on each turn
FCA cards are legal in Commander, Legacy, and Vintage, and each card is also legal in any other format where its already legal (e.g., Lightning Bolt is Modern-legal)
But then he transforms into One-Winged Angel, and his power becomes all too clear
It's built around casting various noncreature spells, and either burning your opponents if you use Y'shtola as your commander, or amassing a battlefield of tokens if you're using G'raha