Community
Rust
Instant
Counter target activated ability from an artifact source. (Mana abilities can't be targeted.)
"How dull it is to pause, to make an end,/ To rust unburnished, not to shine in use,/ As though to breathe were life!" —Alfred, Lord Tennyson, "Ulysses"
Rulings (2)
Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.
Jun 8, 2016
Can’t be used on mana abilities because they don’t use the stack. They’ve already resolved by the time you get priority.
Oct 4, 2004
Legality
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