"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." You must still follow any timing restrictions and permissions, including those based on the card's type
However, in some unusual cases, that Treasure token might enter as a creature, in which case it might impact whether you get Fish or not
That said, game play demand often beats edition in the long run
The invocations will definitely keep her price down, though, so dont get too many copies
In a four-player game, one will likely just have zero or one, so nothing will happen with that person, just like a Balance
This Gideon, like all the walkers in War, comes with a static effect, rewarding you for attacking with 2+ non-Gideon Creatures