Asha, Titan of Smoke

Asha, Titan of Smoke enters the battlefield tapped
unless you sacrifice another spirit or elemental.
Haste, menace.
When Asha attacks, exile the top card of your
library. You may play that card as long as it
remains exiled. Asha gets +X/+X until end of turn,
where X is the exiled card's mana value.
She will cover the world in ash and smoke.