Assassin/Ninja Help Is That Good?

i made a build for nullification idk if its good so... https://wynndata.tk/s/s8bor5
i think this could be better when i look at it its like its ok but there is something more that this build needs but what can someone help and tell whats bad or good

 

you probably shouldn't use cancer in this build
and you should aim for 1 or 2 mana spins (preferably 1) in pretty much any assassin spell build

 

You should also try and only use one type of powder. Here's a 1 cost 9k spin one if you want, the mana might be a little low but you can still survive https://wynndata.tk/s/uxo4mf

 

lets think about the powder ability 2 maybe water if its 1 cost and fast speed water ability could be better i think what about hp i dont rly know about in game but i think this life steel should be higher

 

Cancer is a "dead slot" in your build. Their build having 9.9k hp is completely fine because they have enough sustain and more importantly, enough defensive sp so their EHP is pretty damn high.

1 mana 9k is really cool as well. Thunder being the powder of choice is reasonable to proc steals.

 

You should also focus on mana steal on an Assassin as you'll be in vanish often, and use -tier attack speed gear to have higher chance to proc steal per hits, and Atlas is great for that