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 Foil - £3.90
Lightly Played Foil - £3.30
Moderately Played Foil - £2.70
Heavily Played Foil - £2.00
Damaged Foil - £1.20
Near Mint Foil Non English - £3.90
Lightly Played Foil Non English - £3.30
Moderately Played Foil Non English - £2.70
Heavily Played Foil Non English - £2.00
Damaged Foil Non English - £1.20