Once they die, both of these cards can cast their Adventure half from your graveyard until the end of the next turn
Timing restrictions based on their types are ignored
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// Menace As Braska's Final Aeon's first or second chapter ability resolves, the next opponent in turn order (or, if it's an opponent's turn, that opponent) chooses a card in hand without revealing it, then each other opponent in turn order does the same
Hold my beer, says Sephiroth, the Savior, whose cosplaying as Atraxa, Grand Unifier is good pretty much everywhere
As you can likely tell by the card, his true form turns out to be the primal Hades, and given his intense nostalgic living in the past, it makes sense that he'd have a Yawgmoth's Will-like effect