Syd Alveye, Scion of Omund

Flash
Haste, Deathtouch
When Syd Alveye, Scion of Omund enters the battlefield, exile all cards from opponents'
graveyards. Choose a nonland card exiled this
way. You may cast that card while it remains
exiled, and you may spend mana as though it
were mana of any colour to cast that spell.