Know thy self, know thy enemy. A thousand battles, a thousand victories.

[KingFu]

While you're on the subject of colours, why don't you place together a small guide on coloured power orbs?

Red - attack x 2
Purple/Pink - ??? I think defense x 2?
Green - full health
Blue - full mana
Yellow - speed x 2

Purple orb is dodge, and a thread based on the orbs isn't needed IMO, since people in PVP usually know what the orb does.