Relentless Killer

Indestructible, Mangle (At the end of the Cleanup
step, put a number of -1/-1 tokens on each creature
equal to the damage Relentless Killer caused it.)
At the beginning of each upkeep, if a player cast
two or more spells last turn, transform him to
Eron, Relentless.
"..only in hindsight did I realize I'd never clashed
with him on a night when the moon was high."
- Baron Sengir