I built two Evoker Mob Statues at a 1 pixel : 2 blocks scale.
The two variants have the arms crossed over the evoker's chest and raised like in the summoning animation, respectively.
Vex not included!
Update: I finally made the Vexes!
Feel free to download and use the statues however you like, but please give credit if you do :)
Check out my Mob Statue Collection for more builds like this!