Shade's Form is a common Enchantment — Aura card from Torment (TOR), collector number 81. Current market price: $0.35 (foil $9.33), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has "{B}: This creature gets +1/+1 until end of turn." When enchanted creature dies, return that card to the battlefield under your control.