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 - $4.70
Lightly Played - $4.50
Moderately Played - $4.20
Heavily Played - $3.80
Damaged - $3.10
NM-Mint Non English - $4.70
Lightly Played Non English - $4.50
Moderately Played Non English - $4.20
Heavily Played Non English - $3.80
Damaged Non English - $3.10
Foil Prices
NM-Mint Foil - $5.60
Lightly Played Foil - $5.30
Moderately Played Foil - $5.00
Heavily Played Foil - $4.50
Damaged Foil - $3.70
NM-Mint Foil Non English - $5.60
Lightly Played Foil Non English - $5.30
Moderately Played Foil Non English - $5.00
Heavily Played Foil Non English - $4.50
Damaged Foil Non English - $3.70