Tsabo's Web
Invasion — rare
Artifact
Tsabo's Web rulings:
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.
2013-04-15: A mana ability is an ability that (1) isn’t a loyalty ability, (2) doesn’t target, and (3) could put mana into a player’s mana pool when it resolves.