Shattered Ego is a common Enchantment — Aura card from Modern Horizons 2 (MH2), collector number 62. Current market price: $0.04 (foil $0.09), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets -3/-0. {3}{U}{U}: Put enchanted creature into its owner's library third from the top.