Snowball Roaches

This is the deck I'm currently using for Gauntlet. Since (almost) every card has 4 copies, this deck is really consistent (or at least as consistent as possible for a Clockroach deck).

The only thing this deck isn't prepared against is hyper-aggro, since it doesn't run Lightning Storm or other AoEs, but instead I've slipped in a playset of Psionic Savant, which can snowball to 10+/10+ very easily.

Often it's the case that you go down to around 6-12 life before you can efficiently populate your board, but most times it's not difficult to gain that life back (thanks to Crown of Possibilities giving lifesteal to a big unit).