Here’s how I looked at this on paper. Start by assuming you could maintain 50% alacrity.
If you can do just a little better than this, you can get 15 shatters in during a 60 second window (about 8 mind wracks, 4 cry of frustration, 3 diversion). So, in theory, you could pull off a shatter every 4 seconds if you could supply enough illusions. So the question is, can you create 45 clones every sixty seconds.
On the supply side, if you get above 50% alacrity uptime, then conceptually scepter block comes up every 4 seconds. So if you used it every time and got it to proc within 1 second, that’s 12 clones every sixty seconds. Sword block looks like you can get about 6 clones. Because you’re blocking a lot, you should be able to get your 3 illusionary defenders from mental defense (and each can be shattered twice). You should also be able to get 5 swordsman illusions good for 2 shatters each. With two uses of mirror images and 2 uses of decoy, you get 6 more clones. So that gives you 40 shatterable illusions. But with each shatter (as long as you don’t have 3 phantasms), you get a free clone from illusionary reversion. So that’s about 13 extra clones for a total of 53 shatterable things in 60 seconds.
Now in real gameplay, it’s extremely hard to hit every window. Sometimes you’re holding a block for two seconds. Sometimes the block misses. Sometimes you generate an extra illusion when you have no shatter available. Plus, you want to use confusing images, so you have some 2-second windows to work around. And when it’s time to recharge the healing mantra, you basically lose 3 seconds.
On the other hand, the starting sequence that I’m describing lets you create and shatter 12 to 16 things in the first couple of seconds of the fight (because you’re burning all the cooldowns while the F5 window is open). So this means you start off with a much higher ratio than 50% alacrity – you have alacrity for probably the first full 12 seconds of the fight continuously. Also, I’m not even considering clones created by scepter auto-attack.
In my own testing, I found it pretty hectic to try to manage all this. And so I’m guessing a pretty steady rate of 4-illusion shatter every 5 to 6 seconds is pretty achievable but also tricky. Still, if you could maintain a fairly decent level of might, the question is whether that’s more valuable than generating torment with MtD. The idea of the build is hybrid damage – but I’m not trying to achieve a 50-50 split between condi and power. Confusing images looks like it has a 2.5 damage modifier and illusionary riposte is 2.0. So even a little bit more power gets a good return from these.
Anyway, I really appreciate the feedback. It looks like I’ll miss the next beta weekend, so I’ll have to wait a while before I can test more.