Kura, Mask of Festivity

Flying, prowess
Whenever you cast a noncreature spell, you may
start a feast. (Create a legendary enchantment token
named Feast with: "At the beginning of your upkeep,
reveal the top card of your library. If it's a creature or
a land card, sacrifice this enchantment." )
As long you control a Feast, noncreature spells
you control cost {1} less to cast.