GG its obvious you are confused. Let me break it down.

For SMN, MP> everything else. There are two ways to get it. Refresh above and beyond perp, or through melee WS.

For Hver, the WS triggers aftermath.

For Nirvana, it does not.

Nirvana, poorly made, depends on Spirit Taker which can miss, or it depends on wasting every other slot and subjob and atma maintaining mp. Take your flavor of fail: 0 haste, 0 aftermath, or 0 avatar. Also, start playing SMN so you know what mp recovery means.