Gideon, Ally of Zendikar is a mythic Legendary Planeswalker — Gideon card from Battle for Zendikar (BFZ), collector number 29. Current market price: $1.26 (foil $4.04), TCGplayer market prices via Scryfall.
+1: Until end of turn, Gideon becomes a 5/5 Human Soldier Ally creature with indestructible that's still a planeswalker. Prevent all damage that would be dealt to him this turn. 0: Create a 2/2 white Knight Ally creature token. −4: You get an emblem with "Creatures you control get +1/+1."