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this around 1500 pts and I know is not a competitive list but I want to know if that will give some headache to other players

HQ
Tyranid prime with deathspitter
Mallanthrope (just because I have one and i like the look it have)

Elite
3 Hive guards
1 venomthrope

Troops
5 tyranid warriors, deathspitter and barbed
6 tyranid warriors, deathspitter and barbed
10 genestealers

Fast
6 tyranid shrike with devourers and barbed

Heavy
2x dakkaflex.

You're right it isn't exactly competitive. I don't think you will give a headache to many players. 10 genestealers will usually not make it into combat. Switch them out for Yrgarl stealers. You have an elite slot. If you do that though you have little objective holders (not that the stealers would hold an objective long.
Not sure the venomthrope will do all that much. There isn't much to cover and those that need cover could find it easily enough on the table.

Walking a dakkafex up will take some time. They are best served in pods.

Not sure this list is very strong but I guess testing it would be a start. Good luck

I know, is hard to built something different than a tervigon spam, hive wing tyrans and a trio of trygons.

I want to try the Venomthrope, is why I got one. I know how weak are the Genstealers but maybe I can change for 5 Yrgarl.

But I must keep going in the way of the Warriors