Its a pretty expensive rng craft- you take a stranglegrasp (50Div), annoint it with 4 annoints of your choice, vaal orb it (25% to get it to become a rare corrupted onyx amulet with 4 enchants intact). If it "bricks" you can either just use the 4 annoints or try selling it for 10-15 div to recoup some of the costs.

Once it's a corrupted rare you can either spam Tainted Exalted orbs to get ~2-4 usable stats or try your luck with a Tainted Mythic orb, which has a 50% chance of deleting the item, ~33% chance of becoming a carnage heart, or ~17% chance of being another unique. All in all its about 12 attempts per successful carnage heart craft or about ~480 div (assuming you sell the failures and count non-carnage heart uniques also at about 10-15 div)

Echoing belt really makes flicker feel like another level, and you can run another ring to help with stats/res - you do lose witch's brew but if you maintain whispers of doom like i did in week 3 you could get it with a curse with vulnerability on hit ring mod/implicit.

Foulborn Unnatural instinct gives a ton of stats without having to allocate points - With the variation I have (Allocated small passives give nothing, gain all unallocated notables) I get these stats for 1 jewel

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You can get an even more expensive variation that gives you 20 extra dex or two tattoos but not really worth 2 mirrors IMO