The Grin Reaper - Game Guide - Diablo III
The mimics can cast spells IF you have them on your skillbar, most worth is Grasp of the dead for the slow effect (i dont think thats wad).
To bad the item itself is rather medicore but i see a lot of potential here, esp since its realy cheap to get for testing.
Other skills working:
- Locus Swarm
- Haunt
- Horrify
- Soul Harvest
You need to have those spells in your skill bar.
Have fun testing and feel free to add more working spells.