its an excellent way of adding ignite stacks, and to do fire dmg aoe around one self, and play a tanky mage lifestealing from dmg over time and ignite ticks
rather make it 3 or 4 way , 1 of them as a kind of buff to allies, 1 to reflect, 1 to the aoe fire/ignite
1 scaling differently
If its an problem that mage has 2 active-abilities that are less activ and more passiv just add more abilities that are buff or passiv centered to other classes
eg, manashield, and auras are still missing, more aggressive buffs that deal dmg it should be fun for party play
please dont limit the ways skills are its a perfect note, that no game has yet.
also there should be no taboos because other games had similar skills yet