You can only use each of the following effects of "Vala, Seidhr of the Generaider Bosses" once per turn
The top has a spot for your trainer ID, and the bottom section is for your character's name, home region number (1-8), and a spot for a bar and QR code (this is mainly for roleplaying purposes, feel free to edit this out)
Youll either overwhelm your foes by going wide or sneak in some clever tricks to tip the scales your way
Therefore, the list of objects it affects is determined once: at the moment when Past in Flames resolves and comes into effect
All you really have to do is avoid anything with global land destruction, no repeatable extra turns, dont intentionally get any 2-card infinite combos, and you cant have any game changer cards
Thats music to the ears of anyone trying to build a deck around the new firebending mechanic, which generates red mana that (normally) only lasts until the end of combat