Zrag the Bloodthirsty

First Strike, Haste
Zrag the Bloodthirsty gets +1/+1 for each opponent while attacking.
Whenever an opponent loses the game, put four +1/+1 counters on Zrag the Bloodthirsty.
Opponents cannot gain control of Zrag the Bloodthirsty.
"You think you are safe?! HA! I will drink from your skull."