Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.
04-10-2004
wotc
The extra mana is not considered part of the activation cost. It is a separate cost.
04-10-2004
wotc
The extra mana is part of the total cost, so cost reducers can be applied to this cost.
04-10-2004
wotc
The additional mana is paid at the same time the spell/ability is cast/activated.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.