Thanks for the responses! I can see why this planeswalker may not make the cut except for as a fringe card drawing spell. I admit that when I saw it, I was thinking about all the other great 3 mana Planeswalkers, not realizing that this Jace might as well just be a Jace Beleren.

I feel like this could still be an option along side Jace Beleren for hitting islands in a Stasis deck, but that’s pretty far from the mainstream competitive metagame.

My friend told me it isn’t good because it doesn’t immediately answer a creature. Is being able to answer a creature a necessary condition for a good planeswalker?

Jace, Mirror Mage 1UU
Legendary Planeswalker — Jace (Mythic Rare)
Kicker 2
When Jace, Mirror Mage enters the battlefield, if Jace was kicked, create a token that's a copy of Jace, Mirror Mage, except it's not legendary and its starting loyalty is 1.

• 1: Scry 2.
  0: Draw a card and reveal it. Remove a number of loyalty counters Equal to that card's converted mana cost from Jace, Mirror Mage.
  4

This card seems like a solid 3 mana planeswalker in vintage due to the relatively low converted mana costs of cards in Vintage decks like Xerox or Bug. Even hitting a Force or DTT doesn’t seem like a terrible trade off. It also has the upside of being able to be kicked for additional card advantage.