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 - $2.10
Lightly Played - $1.70
Moderately Played - $1.50
Heavily Played - $1.30
Damaged - $1.10
Near Mint Spanish - $2.10
Lightly Played Spanish - $1.70
Moderately Played Spanish - $1.50
Heavily Played Spanish - $1.30
Damaged Spanish - $1.10
Foil Prices
Near Mint Foil - $3.70
Lightly Played Foil - $3.00
Moderately Played Foil - $2.60
Heavily Played Foil - $2.20
Damaged Foil - $1.90
Near Mint Foil Spanish - $3.70
Lightly Played Foil Spanish - $3.00
Moderately Played Foil Spanish - $2.60
Heavily Played Foil Spanish - $2.20
Damaged Foil Spanish - $1.90