You choose targets for that ability as it goes on the stack

1 Wildcard of any rarity A common (4.2%), uncommon (74.1%), rare (16.7%), or mythic rare (2.6%) from the Magic: The Gathering | Avatar: The Last Airbender main set An uncommon scene card (less than 1%) A rare or mythic rare scene card (less than 1%) A rare or mythic rare field notes card (less than 1%) A rare or mythic rare battle pose card (less than 1%) A rare or mythic rare elemental frame card (less than 1%) A mythic rare borderless double-faced Saga card (less than 1%) 1 Rare or mythic rare A rare (80%) or mythic rare (12.6%) from the Magic: The Gathering | Avatar: The Last Airbender main set A rare (1.6%) or mythic rare (less than 1%) scene card A rare (1.4%) or mythic rare (less than 1%) field notes card A rare or mythic rare battle pose card (less than 1%) A rare (2.4%) or mythic rare (less than 1%) elemental frame card A mythic rare borderless double-faced Saga card (less than 1%) 1 Traditional foil card of any rarity A common (53.9%), uncommon (36.7%), rare (6.7%), or mythic rare (1.2%) from the Magic: The Gathering | Avatar: The Last Airbender main set An uncommon scene card (less than 1%) A rare or mythic rare scene card (less than 1%) A rare or mythic rare field notes card (less than 1%) A rare or mythic rare battle pose card (less than 1%) A rare or mythic rare elemental frame card (less than 1%) A mythic rare borderless double-faced Saga card (less than 1%) 1 Land card A non-foil common dual land (40%) A non-foil default frame basic land (20%) A non-foil Avatar's journey basic land (10%) A non-foil Appa basic land (10%) A traditional foil common dual land (10%) A traditional foil default frame basic land (5%) A traditional foil Avatar's journey basic land (2.5%) A traditional foil Appa basic land (2.5%) 1 Non-foil DFC helper card or double-sided token Note: Percentages may not sum to 100 due to rounding

I just think Rydia's Return is overcosted and not good enough, though it does seem good out of the sideboard for slower matchups
I definitely dont think he will go down in value though
you no longer need to worry about an opponent who sweeps it aside with Wrath of God or whatever everybody else does to handle your legendary board, so its easier to rebuild
Having not played in so long I grabbed myself the preconstructed Final Fantasy 10 Commander deck and while I enjoyed looking through it all, it wasnt until I got a chance to play it that I got a true appreciation of just how much this set feels like playing the game