The key is might. Thoughtseizing Ad Nauseam on Turn 1 might take a Lotus Bloom, you might stunt a turn of acceleration against a Titanshift opponent with multiple whammies, and if you dont have the kill spell for Goblin Electromancer, you might just need to choke Storms progression
I have no idea whether or not this will happen in practice, but Glorious End is an interesting effect that didn't exist in Modern before, so it's likely worth considering, at the very least
Many threats return from the graveyard, making this a premier hand disruption spell for the upcoming Standard format
Finally, the expansions focus on the original 151 Pokmon enhances this cards appeal
Multiple cards have abilities that begin with "At the beginning of your end step, if you descended this turn." These cards don't need to have been under your control at the time you descended