Gelid Shackles

Oracle Text

Enchant creature

Enchanted creature can't block, and its activated abilities can't be activated.

S: Enchanted creature gains defender until end of turn. (S can be paid with one mana from a snow permanent.)

Card Rulings

7/15/2006 Gelid Shackles doesn’t stop static abilities or triggered abilities from working. It also won’t prevent the creature from attacking unless the enchanted creature is given defender before attackers are declared.
6/8/2016 Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.