Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.
2007-07-15
Activated abilities of copies of a spell with that name (such as Lightning Storm) cannot be activated.
2007-02-01
The named card can be cast face down.
2007-02-01
You can name either half of a split card, but not both. If you do so, that half (and both halves, if the split card has fuse) can’t be cast. The other half is unaffected.
