Like most Magic: The Gathering cards, the value of Ultima depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Final Fantasy)
it'd be a shame if something happened to it
Keep in mind that Coram's ability lasts for the entire turn
Nehebs the type of card that can chain together a bunch of Earthquake-style effects to wipe the table out in a single turn
The bigger issue is that, as we talked about before, it's not just (or even primarily) Reserved List cards being counterfeited
Until end of turn, you dont lose this mana as steps and phases end. Mana is good, it only costs three to reconfigure, and you could fund some monstrous turns with this