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 - $5.20
Lightly Played - $4.20
Moderately Played - $3.70
Heavily Played - $3.20
Damaged - $2.60
Near Mint Spanish - $5.20
Lightly Played Spanish - $4.20
Moderately Played Spanish - $3.70
Heavily Played Spanish - $3.20
Damaged Spanish - $2.60
Foil Prices
Near Mint Foil - $6.60
Lightly Played Foil - $5.30
Moderately Played Foil - $4.60
Heavily Played Foil - $4.00
Damaged Foil - $3.30
Near Mint Foil Spanish - $6.60
Lightly Played Foil Spanish - $5.30
Moderately Played Foil Spanish - $4.60
Heavily Played Foil Spanish - $4.00
Damaged Foil Spanish - $3.30