Agatha of the Vile Cauldron
Legendary Creature — Human Warlock
Activated abilities of creatures you control cost 
less to activate, where X is Agatha's power. This effect can't reduce the mana in that cost to less than one mana.
: Other creatures you control get +1/+1 and gain trample and haste until end of turn.
1/1
Illustrated by
Wilds of Eldraine#360MythicEnglish