while it might be true that Necro is the fastest T13 class now, still the thing bagstone mentioned remains true. Most of the time people trying to get T13 to work even tho they should just lower the difficulty and be more efficient.
While OP asked for fastest T13 class I still have the feeling he meant to just ask for the fastest rift farming method in general
Everything melts, you don't even need the Manald Heal proc. 3) In the beginning of the rift many classes struggle a bit to "get things going", and that includes the non-MH wizard. But Manald Heal is the solution here: once it procs, the first elite is dead, In-Geom is up, and the party begins.
that might be true, so the aim is to always kill the first elite while having 4 Tal Stacks. If the first elite takes to long just lower the difficulty.
There is no reason to reason to not have Avarice (and Hoarder) equipped. Main reason being the speed and also because you can now empower like almost all of your grifts.
If you're talking about the MH/Avarice combo without Obsidian then yes this is a thing (but then again I would prefer SoJ or CoE over MH for 2min rift clears on average)
I just prefer the constant dmg, and it's fast enough on T10 early season and can be efficient up to T12 with perfect gear and some augments / paragons. Also I use Obsidian as 2nd ring. While it's useless in most of the rifts I dont like switching rings (lazy ^^) and some maps are so bad that I need it sometimes.
Also the things I mentioned in my previous post just focus on doing constant Beam dmg all the time. If you run MH there is no way to proc gems like trapped. Just when MH procs, but then everything is dead anyway and you wont need it (especially not for the beam dmg itself)