Asharderis, King of Demons

Eminence — Whenever you cast another Demon
spell, if Asharderis is in the command zone or on
the battlefield, target player loses 1 life, and you
gain 1 life.
Flying, Indestructible
When Asharderis enters the battlefield, untap all nonland permanents you control.
You may cast Demon spells from your hand as
though they had Flash.