Brown Ouphe , : Counter target activated ability from an artifact source. (Mana abilities can't be targeted.)
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.
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: Counter target activated ability from an artifact source. (Mana abilities can't be targeted.)