Agatha of the Vile Cauldron (Wilds of Eldraine)

Legendary Creature Ñ Human Warlock - Activated abilities of creatures you control cost {X} less to activate, where X is Agatha's power. This effect can't reduce the mana in that cost to less than one mana.
{4}{R}{G}: Other creatures you control get +1/+1 and gain trample and haste until end of turn.