All of the decks were used to expertly enhance their sets in some way, fleshing out themes or providing extra flavor
(10/2/2025) "Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack." (10/2/2025) You must still follow any timing restrictions and permissions, including those based on the card's type
So, building around TAUC mechanics like convoke and station is a way to access game-breaking tempo plays essentially for free, as a reward for doing something which is already valuable on its own at all points of the game
The Limit Break Commander deck is currently selling for roughly $52 on TCGplayer
Primordial Hunger and Savage Auras theme decks
This is a really interesting way to balance the format, if perhaps a bit unwieldy in practice