Duke Eclipser, the Unseen

{1}{b}{b}{r},{t}: Search your library for a vampire
card with converted mana cost X or less, where X
is the number of vampires you control. Put that
card onto the battlefield, then shuffle your library.
"Knight of the endless dusk, your blade is the whisper
that seals the fate of our foes. Your loyalty, a fortress
against the onslaught of time. With you at my side,
our reign is as eternal as the night sky"
—Olivia Voldaren