This makes it much easier to ramp out your creatures later, or have mana available for interaction on your opponents' turns
For the longest time this was thought to be an error and done by accident, but thanks to the info presented in this thread by @styluspt , we now know it was most likely intended as the first English Secret Rare card instead
One, a Bant list tentatively titled 'Cat Staff', uses Jolrael, Mwonvuli Recluse to pop out cat tokens that power the staff, while an Azorius version uses Shorikai, Genesis Engine instead
Split Blast then closes games for 100 (discarding one Energy) or splits 50 across multiple Defenders if your opponent has them spread out
You can instantly see the lowest price for a Near Mint copy, the cheapest Lightly Played copy, etc
This is certainly the case for Once Upon a Time, which has been banned in five formats to date