Double Cleave works great in conjunction with other instants, especially colossal might.  Even better when both are used on gloryscale viashino.  This deck wins in 4-6 turns fairly often.  Unsurprisingly, terrible with 4+ players.  Needs tuning, updating.  Makes for short games, but not very fun in my playgroup.  No one wants to die that early...
Needs 2 more Boros Swiftblade.
Updated 4-8-2011.