Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.
2006-07-15
wotc
Can't reduce Snow mana costs.
2004-10-04
wotc
Only affects the generic mana part of activation costs. Colored parts of mana costs are not affected.
2004-10-04
wotc
Can be placed on artifacts with no or zero activation costs, but this has no effect on them. It does not increase the cost to one.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Not Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Legal
Premodern
Not Legal
Predh
Legal
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