Gideon Blackblade is a mythic Legendary Planeswalker — Gideon card from War of the Spark Promos (PWAR), collector number 13p. Current market price: $1.93 (foil $3.47), TCGplayer market prices via Scryfall.
During your turn, Gideon Blackblade is a 4/4 Human Soldier creature with indestructible that's still a planeswalker. Prevent all damage that would be dealt to Gideon Blackblade during your turn. +1: Up to one other target creature you control gains your choice of vigilance, lifelink, or indestructible until end of turn. −6: Exile target nonland permanent.