Ares, God of War

Haste, Double Strike, Flying, Indestructible
If Ares, God of War kills another creature
put a number of +1/+1 counters on it equal to
that creatures converted mana cost, then untap it.
There is an additional combat phase after this one.
If a player loses the game put 10 +1/+1 counters
on Ares, God of War, then take an extra turn
after this one.