Should be replaced with something like "Enhanced Kassatsu II", granting a 2nd charge of Kassatsu for moar deeps.

One combo gives you 25 Ninki, you need 50 for any spender. There is no reason to use Meisui. Period. Especially if you make proper use of your rotation for Suiton/Trick Attack, into your heavier Mudra spenders using Kassatsu, and then following up with Doton/Raiton/Katon... you have endless amounts of power without the need for Meisui.