Unstable set cube that includes a few cards from Unhinged and Unsanctioned. It's meant to play pretty close to a set cube with a little extra goofiness thrown in.

Unstable is based around 5 factions that have several overlapping mechanical themes:

Order of the Widget:
Primarily contraptions and artifacts matter.

Agents of S.N.E.A.K.:
Stealing things and causing trouble.

League of Dastardly Doom:
Rolling dice! Watermarks!

Goblin Explosioneers
Combo of dice and goblins and contraptions.

Crossbreed Labs
Host/Augment!