Counter target activated ability from an artifact source. (Mana abilities can't be targeted.)
Mana cost
G
Mana value
1
Printings
From
$0.58
EDHREC rank
#27973
Buy
Formats
Legacy
Legal
Vintage
Legal
Commander
Legal
Pauper
Legal
Rulings
4 Oct 2004
Can’t be used on mana abilities because they don’t use the stack. They’ve already resolved by the time you get priority.
8 Jun 2016
Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.