Keres, Contested World

{t}: Add {c} to your mana pool.
Attacking creatures you control get +2/+0,and attacking creatures your opponents control get -2/+0. Blocking creatures you control get +0/+2, and blocking creatures your opponent controls get -0/-2.
"Control of Keres could tip the balance toward the Scavengers, interesting. Send the Garanoshan" -Pontiff Toi