Skull of the Betrayer

Whenever a creature with power 5 or greater
dies, put a malice counter on Skull of the
Betrayer. Then if Skull of the Betrayer has five
or more malice counters on it, transform it.
Skull of the Betrayer can be your commander.
"Those snakes have no idea what they're doing
messing with his skull..." - Ruga, Exiled Agent