Way of the Mentor is a uncommon Legendary Enchantment card from Reality Fracture (FRA), collector number 208. Current market price: $0.30 (foil $0.44), TCGplayer market prices via Scryfall.
When Way of the Mentor enters, empower Jace 5. (Put five 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.") Whenever you gain life, put a loyalty counter on each planeswalker you control.