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 - $4.50
Lightly Played - $4.25
Moderately Played - $3.50
Heavily Played - $2.75
Damaged - $2.25
Near Mint Non-English - $4.50
Lightly Played Non-English - $4.25
Moderately Played Non-English - $3.50
Heavily Played Non-English - $2.75
Damaged Non-English - $2.25
Foil Prices
Near Mint Foil - $4.75
Lightly Played Foil - $4.50
Moderately Played Foil - $4.00
Heavily Played Foil - $3.00
Damaged Foil - $2.50
Near Mint Foil Non-English - $4.75
Lightly Played Foil Non-English - $4.50
Moderately Played Foil Non-English - $4.00
Heavily Played Foil Non-English - $3.00
Damaged Foil Non-English - $2.50