I used it almost all the time when I was leveling in HS. Besides the fact it lasts 2 mins and has a 2.5 min cooldown, 6 mana per tick is the same mana regen that POTG gives so if it's used on cooldown it's slightly less mana than POTG in the long run.
There will be rare occasions you really need the slot that WM is in + 1 swap slot, but most of the time it's worth keeping mem'd and using.
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