Interesting. It should work, but Wizards won't capitalize much from this. The debuff lasts what? 5 seconds? I dont think u can stack 4 debuffs. Maybe 2 since each debuff runs its own timer and by the time the last Blackhole pulls the same mob, the first and even second debuff should be over. Not to mention de cooldown u have, making it hard to repeat at will.

Meanwhile Crusaders can stack several times really fast since your main attack don't have any delay, and by the look of the skill, it knockbacks almost every cast with just 1 Crusader. U don't need a rotation or anything in this case. Worst case scenario, u will have 2 stacks on 100% of the time. 3 stacks around 50% and 4 stacks 25% of the time or so. No real math behind this, just assumptions.

I'll try this for sure.