Voidforge

Is a Sweep voidforge possible on Trickster?

Everything is "possible". Now the questions are how strong can it be, how much investment would it require, and would you have better results with a different skill or different class.

That's hard to discuss without having the build presented, especially if it's a build adapted from someone else's build / guide then it would be easier to compare what would you gain / lose by going trickster instead of whatever the original was.

I'm trying to do a somewhat similar build to mathil build. https://pastebin.com/tyXEgYzn

Will be hard to "do something similar" since he mostly takes nodes around Duelist, Templar and Marauder areas which are completely opposite side than Shadow area.

You would have to invent your own version of the talent tree focusing on similar properties as he does, which seems to be crit and elemental penetration.

It's this build right? https://www.youtube.com/watch?v=9IuovHKMBRw

You'd have to pay attention what made the build strong and how expensive it is (Mathil builds usually are) and whether you can replicate it yourself.

Easiest thing to do would be to level a new character and copy his build fairly faithfully, budget permitting. Assuming it doesn't rely on some obscure mechanics (I remember Mathil's build that required specific rng roll on timeless jewel, it was spectral shield throw / crown of eyes build during legion...)