Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)
"It is technically an ooze, but its lifespan measures only seconds. In that short time, its appetite for magic is extraordinary."
—Simic research notes
Near Mint - $2.10
Lightly Played - $1.90
Played - $1.50
Heavily Played - $1.30
Damaged - $1.10
Near Mint Non-English - $2.10
Lightly Played Non-English - $1.90
Played Non-English - $1.50
Heavily Played Non-English - $1.30
Damaged Non-English - $1.10
Foil Prices
Near Mint Foil - $1.30
Lightly Played Foil - $1.20
Played Foil - $0.90
Heavily Played Foil - $0.80
Damaged Foil - $0.70
Near Mint Foil Non-English - $1.30
Lightly Played Foil Non-English - $1.20
Played Foil Non-English - $0.90
Heavily Played Foil Non-English - $0.80
Damaged Foil Non-English - $0.70