Thraxes, Titan of Fire's Fury

When Thraxes enters the battlefield, sacrifice it
unless it escaped.
When Thraxes enters the battlefield it deals damage
to target permanent equal to the number of
mountains you control, then add {r} equal to the
number of mountains you control to your mana pool.
Escape—{r}{r}{r}{r}, Exile four other cards from
your graveyard and sacrifice a mountain.

"Be reborn, my first nyxborn..."
—Purphoros, God of The Forge