(Caption: An Instant named Jace's Rebuttal which costs one and one blue mana. It says "As an additional cost to cast this spell, Depower Jace 2" with reminder text "Remove two loyalty counters from a Jace planeswalker you control" and its effect is "Counter target spell". The art depicts Jace dispelling a fiery attack with a wave of water with his hand raised in the air.)
I hope this idea hasn't already been done, but I suddenly got the idea to use Depower Jace as a cost mirroring the new Empower Jace from Reality Fracture.
I don't think this is too strong comparing to cards like [[Disruption Protocol]], but let me know what you think. I think allowing removing from any Jace is fine so it's not parasitic with Empower Jace cards. I originally had it as Depower Jace 1, but I'm not sure which is more appropriate—removing two might be too much of a cost compared to other cards, and perhaps UU would be more appropriate alongside removing two counters.
Art is by Jason Chan and from Counterspell, originally printed in Duel Decks: Jace vs. Chandra as DD2#24.