Rust
Oracle Text
Counter target activated ability from an artifact source. (Mana abilities can't be targeted.)
Card Rulings
10/4/2004 Can’t be used on mana abilities because they don’t use the stack. They’ve already resolved by the time you get priority.
6/8/2016 Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.
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