Stratus Walk is a common Enchantment — Aura card from Born of the Gods (BNG), collector number 52. Current market price: $0.13 (foil $0.32), TCGplayer market prices via Scryfall.
Enchant creature When this Aura enters, draw a card. Enchanted creature has flying. (It can't be blocked except by creatures with flying or reach.) Enchanted creature can block only creatures with flying.