However, there isn't a complete overlap between the two
In some cases, cards are even adjusted from their original printing
As a companion it would be ubiquitous in any blue-red-X deck given the formats singleton nature, which gives those decks an extra card for free without any additional deckbuilding costs or restrictions
Meanwhile, Return of the Wildspeaker is mostly in our deck to be a bad Overrun, allowing us to pump all of the 1/1 tokens Rin and Seri make into 4/4s at instant speed and potentially kill our opponent with one big attack
I understand that this is an uncommon and Sheoldred, the Apocalypse is mythic rare, but the massive disparity in what is supposed to be similar utility sets is not even comparable at this point
As is always the case in Magic: The Gathering, however, effects that double anything need to be treated with extreme caution