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 - $9.70
Lightly Played - $9.30
Moderately Played - $8.80
Heavily Played - $7.80
Damaged - $6.30
NM-Mint Non English - $9.70
Lightly Played Non English - $9.30
Moderately Played Non English - $8.80
Heavily Played Non English - $7.80
Damaged Non English - $6.30
Foil Prices
NM-Mint Foil - $10.30
Lightly Played Foil - $9.80
Moderately Played Foil - $9.30
Heavily Played Foil - $8.20
Damaged Foil - $6.70
NM-Mint Foil Non English - $10.30
Lightly Played Foil Non English - $9.80
Moderately Played Foil Non English - $9.30
Heavily Played Foil Non English - $8.20
Damaged Foil Non English - $6.70