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.
NM-Mint - $11.20
Lightly Played - $10.60
Moderately Played - $10.00
Heavily Played - $8.90
Damaged - $7.30
NM-Mint Non English - $11.20
Lightly Played Non English - $10.60
Moderately Played Non English - $10.00
Heavily Played Non English - $8.90
Damaged Non English - $7.30
Foil Prices
NM-Mint Foil - $15.50
Lightly Played Foil - $14.70
Moderately Played Foil - $13.90
Heavily Played Foil - $12.40
Damaged Foil - $10.10
NM-Mint Foil Non English - $15.50
Lightly Played Foil Non English - $14.70
Moderately Played Foil Non English - $13.90
Heavily Played Foil Non English - $12.40
Damaged Foil Non English - $10.10