Lost in Thought is a common Enchantment — Aura card from Judgment (JUD), collector number 45. Current market price: $0.22 (foil $0.57), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature can't attack or block, and its activated abilities can't be activated. Its controller may exile three cards from their graveyard for that player to ignore this effect until end of turn.