Soven, Lord Executioner

Soven, Lord Executioner has indestructible if you control three or less other creatures.
Whenever another creature leaves the battlefield,
put a head counter on Soven, Lord Executioner.
Then, if Soven, Lord Executioner has four or
more head counters, you may remove all head counters from Soven. If you do, transform Soven.
"Heads for the Blood God."