You can handle mystic without spark
A good mystic can easy use the mystress leech energy,getting almost the spark effect (200% more damage)
3 spark gives 500% (that's true,but uses much energy)
2nd spark gives 300% -> mystress gives 200%. A low deference,but if u use growth too,u get a DAMN FCKED DAMAGE.U can drop any1 with that. So 3 spark is useless.