good bossing, Aoe mobbing, mobility ... Evan is what come up in my mind.
Evan has 35% attack passive that hugely boost your range. His attack speed is also very high for a mage class (+1 attack speed bonus from fusion skill). As for mobbing, there're some variety of combo skills you can use. Earth Breath and Wind Flash are good skills that lock on targets. Earth Dive is useful for large mobs like ones in DIPQ. Return Flame is a DoT skill that cover areas where you and mir can't reach (especially useful on large maps).
As for mobility, telecasting will make it easier for many boss mechanics that require you to move constantly like Magnus or Chaos Vellum. Additionally, Evans have a vertical jump that is useful for grinding.
As amazing as evan is, many don't like the class because there're too many skills. However, I think that's what makes a magician: utility and variety of skills. If you like having to memorize combo skills like memorizing magic spells, evan is the class for you.