Hello everyone, I have recently been theorycrafting purchasing tear on enchanters to combat one of the main issues they have which is mana sustain in lane because if you take an extended trades you can go OOM very fast which makes you susceptible to dives and also Spellthief's Mana regen was nerfed. So here is my thoughts on each enchanter with tear.

Sona - It is very good

Nami - Having tear feels really good in lane especially if you are playing a scaling nami build or have a scaling ad carry such as xerath.

Rakan - Haven't played it yet but a high elo player (lovelist) has consistent successful results with Q max tear Rakan so its probably good.

Milio - It feels good in lane but having items is more important later so it can be sold and also his cd's are quite high so stacking it doesn't feel that good.

Yuumi - Very nice to have tear on yuumi now that her E is no longer percentage based.

Karma - Probably bad because karma wants to snowball and have items ASAP.

Soraka - Seems pointless because you cant even spam W unless you have warmogs which is very expensive. This build is not efficient.

Lulu/Janna - No thoughts as of yet.

Renata Glasc - probably bad

Orianna - Probably good

Morgana - Bad Champion

Annie - Doesn't feel like she has enough mana issues to justify buying the tear and delay items

Zilean/Bard/Senna/Ivern - No clue cuz I don't really play them much at all

Seraphine/Lux - Is not an enchanter.