Xartog, the Earth Rumbler

Xartog, the Earth Rumbler has protection from blue and from green
All creatures you control gain +3/+3.
On your upkeep, sacrifice two creatures. If you cannot sacifice any creatures, tap Xartog, the Earth Rumbler and you lose 5 life.
Xartog looked at the war and said to himself, "This war must end."