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 Foil - $3.40
Lightly Played Foil - $3.20
Moderately Played Foil - $3.10
Heavily Played Foil - $2.70
Damaged Foil - $2.20
NM-Mint Foil Non English - $3.40
Lightly Played Foil Non English - $3.20
Moderately Played Foil Non English - $3.10
Heavily Played Foil Non English - $2.70
Damaged Foil Non English - $2.20