Shifting Shadow is a rare Enchantment — Aura card from Commander 2017 (C17), collector number 28. Current market price: $0.29, TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has haste and "At the beginning of your upkeep, destroy this creature. Reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and attach Shifting Shadow to it, then put all other cards revealed this way on the bottom of your library in a random order."