zodiac mage would have a wheel that starts the game at a position determined by a d12. each position grants a different buff. eg
aries = charge + 1,
Leo = piercing + 1,
Gemini = +1 melee for each pair of identical creatures on board,
Scorpio = all mele attacks have 11+ to taint etc.
additionally each of the 12 signs of the zodiac fall into one of the 4 elements earth, water, fire or air so the Mage will get +mele or range when he uses the related spell.
the zodiac position will move to the next one at the end of every turn, and the mage as a quick action can role the d12 to change the position.