Rust 
Instant
Counter target activated ability from an artifact source. (Mana abilities can't be targeted.)
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Instant
Counter target activated ability from an artifact source. (Mana abilities can't be targeted.)