Theron, Undying King

Theron, Undying King enters the battlefield with
six -1/-1 counters on them.
Boast—{b}: Remove a -1/-1 counter from Theron,
Undying King and place one -1/-1 counter on
another target creature.
{b}{b}: Regenerate Theron, Undying King.
"The bastard just won't rest!"