Good brawl. Pick a 10 card deck (no duplicates). Every turn you discover a card instead of drawing. Ordinary draws draw a 1 mana discover-a-card-in-deck spell instead of drawing from your deck.
Right now I'm running an infinite quest mage, which should be improvable. You replay the quest whenever you finish it, so you get infinite turns.
Open the Waygate
Primordial Glyph
Sorcerer's Apprentice
Arcane Intellect
Frost Nova
Ice Block
Simulacrum
Echo of Medivh
Molten Reflection
Polymorph <--- this is probably the weakest card in deck...
Interesting opponent decks seen: gnomeferatu warlock (which is just RNG whether it hits something important), infinite priest (within one turn, using northshire+radiant elemental). There's an aggressive hunter deck that keeps beating me, but I think it's bad.
Edit: Apparently this is a repeat brawl. Maybe I missed playing it the first time.