Because of the wizard's choice of elemental training, there are effectively four wizards.
Because of the Paladin's choice of auras, there are effectively eight Paladins. EIGHT!
If you include all four wizards, the core set has 7 mages. If you include all 8 Paladins, Paladin vs Siren has 9 mages!
I WILL get this set. Definitely.
Also, it just occurred to me that if you count the wizard as four different mages, then there are currently 15 arena mages, not just 12, which would mean that wizards are a fifth of all the mages, so that might account for the wizard's higher win-ratio to some extent.
9+15=24. Paladins will be one-third of all the mages. Just a heads up before people start saying the paladin is OP because he wins so much. The paladin is more than one mage, just like the wizard.