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 - $2.100
Lightly Played - $1.700
Moderately Played - $1.500
Heavily Played - $1.300
Damaged - $1.100
Near Mint Spanish - $2.100
Lightly Played Spanish - $1.700
Moderately Played Spanish - $1.500
Heavily Played Spanish - $1.300
Damaged Spanish - $1.100
Foil Prices
Near Mint Foil - $3.800
Lightly Played Foil - $3.000
Moderately Played Foil - $2.600
Heavily Played Foil - $2.300
Damaged Foil - $2.000
Near Mint Foil Spanish - $3.800
Lightly Played Foil Spanish - $3.000
Moderately Played Foil Spanish - $2.600
Heavily Played Foil Spanish - $2.300
Damaged Foil Spanish - $2.000