Lost in Thought | Magic: The Gathering
Formats Lost in Thought is Legal in
Official Oracle Text for Lost in Thought
Enchanted creature can't attack or block, and its activated abilities can't be activated. Its controller may exile three cards from his or her graveyard for that player to ignore this effect until end of turn.
Official Rulings for Lost in Thought
7/1/2013 : Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities; they have colons in their reminder text.