The Black Soulstone

{6} Activate The Black Soulstone. Only activate if a creature named Zoltun Kulle is on the field.
{r}{b}{t} If Belial, Lord of lies, Azmodan, Lord of sin,
Diablo, the lord of terror, Baal, Lord of destruction, Mesphito, Lord of hatred,
Andariel, Lord of anguish, and Duriel, Lord of Pain in exile: search your library for a card named
Diablo, The Prime Evil
and put him on the battlefield. This ability can only work with these lords and Activation cost is paid.