Both of my decks are unupgraded since that is how I roll. Yes, I have upgraded cards (fire towers and cremations mostly) but I play unupped league and unupped tournaments. If/when it comes time to take the position of Master I'll endeavor to get the rest of my main decks upped.
Mono Phoenix-Bolts
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I've used this in tournaments, specifically the no permanents variant. It's very effective in that format because Phoenix are very resilient to creature destruction, and with no shields or artifacts for defense, creatures and creature control are dominant. Generally you want to use early Fire Bolts to take care of whatever early threats your opponent lays out. Depending on how the game is going you can start thinking about saving some for a kill shot as your fire quanta stacks up.
No Land (Fiery) Stompy
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For a 15/15 Split I went with a pillarless variant. It is all about getting a good opening hand and running as fast as you can to the finish line. Decent against T50 and excellent vs AI3's you can also pull of some amazing abrupt victories in PvP that'll leave the other player wondering what just happenend. It's an unupgraded deck capable of winning in 4 turns.