I suggest you try it today because once prepatch hit it will get drastically harder. Losing all corruptions, essences, and azerite bonuses.
Mechagon 2 set healing rings. (manditory)
if… Heal target (highest ilvl you can get)
if… Use 3 different abilities (any item level)
Recommended Healing Trinkets
415+ [Mirror of Entwined Fate] – BFA Mythic Raid : BOD
465+ [Revitalizing Voodoo Totem] – BFA Mythic+ : AD
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With just voodoo totem + crucible of flame you can easily clear up to gold rank and endless 9 if you casually use bandages.
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With both trinkets and flame you can probably clear up to endless 9-19 casually using bandages.
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To clear anything effectively past wave up to 20 or up to 30 you WILL need both trinkets + crucible + bandages popping them like candy (especially to get safely through waves 19 & 29. during the end of wave 18 & 28 everything must be off cooldown, with 2 charges of flames and all trinkets ready, these are 100% mandatory to clear wave 29 successfully+ you have near perfect interrupt timing, and stun/fear cycling.)
…and ya at least 62+ hours of proving grounds probably more.
40 hours of proving grounds over the last few months.
Till I theory crafted the optimum load out I needed.
From there it was another 12 hours last wednesday.
Followed by another 12 hours this morning.
The last 6 hours of it I was doing absolute crazyness and random builds. I managed to clear through wave 28 near perfectly using only 1 crucible proc early on and first aid only after that with 3 ring procs. I entered wave 29 with everything up. On wave 29 I had perfect RNG spacing on friendly units after the first splash knock back. Nothing was double stacked and nothing had double debuffs. Popped my voodoo early on the tank. followed by a spot heal with the second trinket on the tank the instant it came off CD, spammed intervines on tank, spam taunted everything that lost agro, had to leap once to get taunt reset agro, landed 3 interupts 2 storm bolts and 2 shockwaves and 1 fear, and 1 warstomp. landed every possible interupt including instcast back to back fear+warstoms into pummel, still ridiculously hard as hell as every party member had less then 10% the rogue had 532 hp at one point when rallying cry ended I about crapped myself when I had to cycle 2 stuns into a pummel to kill the aoe caster, and prayed that he wasnt targeted by a dispell cast. Abilities were casting and going off left and right as heals came off less then 1 GCD within fractions of seconds and between enemy casts. Was crazy freaking hard until the main caster died. Alls I did was focus on interupting every cast as it was 35% raid health per cast it went off, and if it was followed by a large dispell exploding it would 1 shot dps. I only made it through wave 29 once… everything I had nearly had zero HP, when the last unit died. I threw a heal on the tank (35% health and on the hunter 50% health, with first aid on the mage at 40% health entering the last phase.) the rogue still had 1-10% health in the first 10 seconds of the last phase. Until I could heal him. When I entered wave 30 I just made it count. Kept agro and spot healed like crazy using every ability I had (except berserker’s rage because nothing feared, I did use it a few times to proc rings out of combat though…), managed to top everyone off above 25% by the end of wave 30 and it was GG! would have gotten further if I wasn’t exploding my guild chat. with OMFG!!! I DID IT!!! made it to wave 33.45.
Picture the difficulty of this being that of a mythic end tier raid boss as a 31+ minute mythic boss encounter, where it gets ridiculously difficult on every 9th wave, and must have perfect execution with every cast prior to that. 1 miss timed ability skill after wave 4 will cause a wipe on the 9th wave every time, any bad RNG will also cause a wipe. You get zero down time, as you constantly interweave ring procs and first aid casting during down time. Casting any and every random ability to proc the ring out of combat, Casting intervene & crucible to keep stacks of conflict and strive at 8+. That small 10 second breather every 10th wave long isn’t long as you can barely get 1 ring proc and maybe 1-2 first aid casts off freely. The only time you kind of get a chance to breath is if you clear a wave with 30 seconds left in a minute by chain proc’ing 5 Twilight-dev’s in a row. Which may happen once every 3 hours. And even then the it normally happens on an EZ wave. Perfect gear optimization, Optimum corruptions, Lots of RNG Luck, Lots of precision, Lots of consumables, Lots of Runes, Lots of Flasks, Lots of Food Buffs, Lots of Scrolls, and thousands of bandages.
So good luck.
(Oh I dropped a katy stamp whistle mail box to get more bandages around wave 5 “you need 120 bandages minimum per full attempt pending where you wipe”. I also had to repair mid run a few times requiring a blacksmithing khazgorian crafting hammer to repair my shield mid as it loses 25+ durability per full attempt.)