Author of Shadows is a rare Creature — Shade Warlock card from Magic: The Gathering (Magic Online Promos, PRM).
Rare
Magic Online Promos (PRM)
{4}{B}
Power / Toughness
3 / 3
Mana Value
5
Colors
B
Card Text
When this creature enters, exile all opponents' graveyards. Choose a nonland card exiled this way. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell.
