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 - $400
Lightly Played - $300
Moderately Played - $300
Heavily Played - $300
Damaged - $200
Near Mint Spanish - $400
Lightly Played Spanish - $300
Moderately Played Spanish - $300
Heavily Played Spanish - $300
Damaged Spanish - $200
Foil Prices
Near Mint Foil - $700
Lightly Played Foil - $600
Moderately Played Foil - $500
Heavily Played Foil - $500
Damaged Foil - $400
Near Mint Foil Spanish - $700
Lightly Played Foil Spanish - $600
Moderately Played Foil Spanish - $500
Heavily Played Foil Spanish - $500
Damaged Foil Spanish - $400