Path of Bravery is a rare Enchantment card from Magic 2014 (M14), collector number 26. Current market price: $0.29 (foil $0.52), TCGplayer market prices via Scryfall.
As long as your life total is greater than or equal to your starting life total, creatures you control get +1/+1. Whenever one or more creatures you control attack, you gain life equal to the number of attacking creatures.