Imagine a 2nd turn Wild Mongrel or Aquamoeba into a 3rd turn four/4 that could be cast as an instant, as long as you discarded it
Countermagic like Spell Pierce helps you protect Emet-Selch, too, which is vital since it needs to survive at least one turn cycle to flip
And while it wont always be worthwhile, and will occasionally hurt your ability to cast spells, I think it more than deserves some attention in Standard
Attached to a massive heavy-hitting Commander, this effect could easily guarantee the win
For more Disney Lorcana, check out our interview with one of the game designers on how the card game came to be
Isshin decks typically combine token generators like Adeline, Resplendent Cathar with burn effects like Hellrider and Purphoros, God of the Forge to blitz the table to 0 before they can react