Mephisto, Lord of Hatred

Flying, Hexproof
When Mephisto, Lord of Hatred dies, search
your library for a card named Mephisto's
Soulstone, and put it onto the battlefield
tapped.
"The skies shall rain fire, and the seas will
become as blood. The righteous shall fall before the
wicked, and all of Creation shall tremble before the
burning standards of Hell!"