Gloom

Enchantment    (CMC:3)

White spells cost an additional to play. Activated abilities of white enchantments cost an additional to play.

5E • ENDouglas Shuler

™ & © 1993—1997 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

10/4/2004
The extra mana is not considered part of the activation cost. It is a separate cost.
10/4/2004
The additional mana is paid at the same time the spell/ability is cast/activated.
10/4/2004
The extra mana is part of the total cost, so cost reducers can be applied to this cost.
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.