Stratus Walk is a common Enchantment — Aura card from Magic Origins (ORI), collector number 77. Current market price: $0.03 (foil $0.29), 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.