Gloom White spells cost more to cast.
Activated abilities of white enchantments cost more to activate.
Reglamento oficial (Oracle)
[2016-06-08]Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.
[2004-10-04]The extra mana is not considered part of the activation cost. It is a separate cost.
[2004-10-04]The additional mana is paid at the same time the spell/ability is cast/activated.
[2004-10-04]The extra mana is part of the total cost, so cost reducers can be applied to this cost.
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more to cast.
