Need info for this combo invicible+recovery hp. (poll)

~HOW TO INVICIBLE (UNTOUCH) AND RECOVERY HP~
COMBO (buff)
spining slash > shadow step (save 400 mp) > warcry (con 100 mp) > flash blast (swift 200 mp)
...
1 COMBO (untouch, 100 mp)
astute/hard hit > meteor breaker (save 600 mp) > phantom slash (smite 400 mp) > shadow step (swift 200 mp)
2 COMBO (untouch+recovery hp, 100 mp)
astute/hard hit > meteor breaker (save 600 mp) > phantom slash (smite 400 mp) > buster blade (con 0 mp) >shadow step (swift 200 mp)
3 COMBO (untouch+recovery hp, 200 mp)
astute/hard hit > meteor breaker (save 600 mp) > buster blade (swift 300 mp) > phantom slash (smite 400 mp) > shadow step (con 0 mp)
4 COMBO (untouch+recovery hp, 200 mp)
astute/hard hit > meteor breaker > buster blade (save 600) > buster blade (con 100 mp) > phantom slash (smite 400 mp) > shadow step (swift 200 mp)
...
Idea :
a. meteor breaker (become invicible while the skill is activated).
b. phantom slash (become invicible mode while in action).
c. Buster blader (Restore a small amount of HP when the buff is added and recovery hp 1000+. The buff is not overwritten.)
d. shadow step lv 10 (AMPR & Increase crit rate of the next skill once).
Note :
Invicible (you can't receive any damage, correct me if i'm wrong)
Asking :
How if we spam buster blade ?
Is that we will recovery our hp every time we use buster blade when we spam it ?
Or buster blade have skill cooldown ?
...
What do you think ?
Need help to get some information about that combo.
It because i need to lv up my char to lv 150 and skill lv 4 required lv 150.
Thank's.​

 

You might want to list some equips. I think this build has the potential to be somewhat overpowered if you could spam by using AMPR equipment.

 

For now, i use equip set crit rate/evasion rate like cake knife (NPC version), assassin garb (NPC version), knife belt (NPC version)/eyepatch (cat, boss version) and xtall mp+200.
For sub weapon i use element/crit damage/unsheathe.
IDK is that combo work or not, because i need to lv up first.
maybe someone can give some information.
COMBO for now :
astute (crit rate)/hard hit (flinch)/spining slash (knock back)/cross parry (reduce any damage received) > phantom slash (save 400 mp) > flash blast (swift 200 mp) > shadow step (swift 200 mp).
note : don't move when use phantom slash if bosses want to hit you (miss because of invicible skill). after that you can move to launch flash blast + shadow step when the bosses loading attack.​