Sylvia, The Forgotten Witch

When Sylvia enters the battlefield create a
Legendary colorless Equipment Mask artifact
token named VoidMask with Equip {10}, and
"Equipped creature has Erode, Hexproof,
and Indestructible."; and equip it to Sylvia.
You may cast spells as though they costed mana
of any type to cast and they cost {1} less mana.
She gave up everything for the power to do anything.