The flashback cost is equal to its mana cost
(2023-06-16) If the creature you choose as your Ring-bearer was already your Ring-bearer, that still counts as choosing that creature as your Ring-bearer for the purpose of abilities that trigger "whenever you choose a creature as your Ring-bearer" or abilities that care about which creature was chosen as your Ring-bearer
This can be the background for Imoen, Mystic Trickster or in Commander, Legacy, Vintage, or Pauper deck with many dungeons to get through
The Grizzly Bears Tier These are both bare and bear necessities
For each time a Pokmon was chosen, do 40 damage to it." Gholdengo ex has some synergy, too: you can also use the Metal Core Barrier Pokmon Tool to take 50 less damage (albeit for one turn)
This Ruby card has an Ink cost of 4, making it pretty easy to get into play too