LELegends

Rust

Rust from Legends
Rust from Legends

Interrupt   {G} (CMC:1)

Counter target artifact effect, which must require an activation cost.

"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"

LE • ENLiz Danforth

™ & © 1993—1994 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):
View this MTG card on Gatherer 
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.
7/1/2013
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder texts.
Card Rust is not on TCGPlayer.