Darth Bane, Sith'ari

Haste
Partner with Darth Zannah
{t},{x}: Sacrifice a Sith with converted mana cost
X, then return a Sith creature with converted
mana cost X or less from your graveyard to the battlefield.
"Two there shall be. No more, no less. One to embody
the power, the other to crave it."