Inspired Tethermage is a common Creature — Elf Warrior card from Reality Fracture (FRA), collector number 109. Current market price: $0.16 (foil $0.25), TCGplayer market prices via Scryfall.
Whenever you put one or more loyalty counters on a planeswalker, put a +1/+1 counter on this creature. {6}: Empower Jace 2. (Put two loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")