I wouldn't run this in spell heavy decks, but I can see lots of play for this in Aggro/creature focused strategies that can use this to just drop extra bodies every turn
Bakersbane Duo Bakersbane Duo pairs squirrels with raccoons, giving you a Food to fuel your foraging and gaining power when you expend
I'm sure I was not the most successful vendor at that event, but I feel vindicated
You'll be slinging spells, sure, but Rootha creates flying Elementals with Haste and power/toughness equal to the highest mana value spell you cast in your first main phase
The deck could immediately win upon resolving Splinter Twin on its Exarch, so even though Splinter Twin did nothing until the turn it won the game and extra copies in hand would be dead, it was worth it
The main determining factor for the potency of a planeswalker ultimate is how easy it is to use it