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 - $4.60
Lightly Played - $4.10
Played - $3.20
Heavily Played - $2.80
Damaged - $2.30
Near Mint Non-English - $4.60
Lightly Played Non-English - $4.10
Played Non-English - $3.20
Heavily Played Non-English - $2.80
Damaged Non-English - $2.30
Foil Prices
Near Mint Foil - $6.00
Lightly Played Foil - $5.40
Played Foil - $4.20
Heavily Played Foil - $3.60
Damaged Foil - $3.00
Near Mint Foil Non-English - $6.00
Lightly Played Foil Non-English - $5.40
Played Foil Non-English - $4.20
Heavily Played Foil Non-English - $3.60
Damaged Foil Non-English - $3.00