Activated abilities of creatures you control cost X less to activate, where X is Agatha of the Vile Cauldron's power. This effect can't reduce the mana in that cost to less than one mana.
4RG: Other creatures you control get +1/+1 and gain trample and haste until end of turn.
Near Mint - $0.70
Lightly Played - $0.60
Moderately Played - $0.50
Heavily Played - $0.40
Damaged - $0.40
Near Mint Spanish - $0.70
Lightly Played Spanish - $0.60
Moderately Played Spanish - $0.50
Heavily Played Spanish - $0.40
Damaged Spanish - $0.40
Foil Prices
Near Mint Foil - $2.00
Lightly Played Foil - $1.60
Moderately Played Foil - $1.40
Heavily Played Foil - $1.20
Damaged Foil - $1.00
Near Mint Foil Spanish - $2.00
Lightly Played Foil Spanish - $1.60
Moderately Played Foil Spanish - $1.40
Heavily Played Foil Spanish - $1.20
Damaged Foil Spanish - $1.00