Nystilas, Avaricious Spite

Nystilas costs {1} less to cast for each noncreature
card in your graveyard.
When you cast Nystilas, you may exile up to four
cards from player's hands. You may play cards
exiled with Nystilas for as long as they are exiled,
and you may spend mana as if it were any type to
cast cards exiled with Nystilas.
Whenever you cast a spell exiled with Nystilas,
it gains +X/+X, where X is the mana spent to
cast that spell.