It's a Twistable Magma Cube that can well... Twist
Credits:
Maki - http://www.pixelpapercraft.com/papercraft/535b6b30063ce55b3d0000a2/high-technology-magma-cube
Frownieman - http://www.pixelpapercraft.com/papercraft/53616438cb44354605000003/advanced-high-technology-magma-cube