Gideon's Resolve is a rare Enchantment card from Amonkhet (AKH), collector number 272. Current market price: $0.15, TCGplayer market prices via Scryfall.
When this enchantment enters, you may search your library and/or graveyard for a card named Gideon, Martial Paragon, reveal it, and put it into your hand. If you search your library this way, shuffle. Creatures you control get +1/+1.