Joint Defense

Barbarians you control get +1/+1.
Centaurs you control get +1/+1.
After your combat phase, if you control a
Centaur and a Barbarian, add {g}{w} to your mana
pool and gain 2 life.
Often suspicious of each other, the Kos and the
Keshik soon realized that they could only fight
together against the hordes of the undead.