Lost in Thought

Enchant Creature    (CMC:2)

Enchanted creature can't attack or block and its activated abilities can't be played. Its controller may remove three cards in his or her graveyard from the game to ignore this ability until end of turn.

45 JUD • ENBen Thompson

™ & © 1993—2002 Wizards of the Coast

Legal in: Odyssey Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Lost in Thought {1}{U} Enchantment — Aura Enchant creature 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.

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10/4/2004
You can take the "exile three cards" action any time you have priority without using the stack.
7/1/2013
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder texts.

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