I would like to be one of the first to submit a deck idea for the next extended season.
This deck uses Time Stretch in a novel way.  To find the origins of this deck, we go back to the Saga era and its Wildfire decks.  Those decks utilized quick mana generation, Temporal Apurtures, and wildfire to clear the way for large creature beats.
This deck takes that 1 step further, giving free turns to generate an unsurmountable advantage.

SEVENTH INNING STRETCH

4  Temporal Apurture (bomb generator supreme)
3  Time Stretch (extra turns are some good, I hear)
2  Wildfire (great way to clear the board)
3  Searing Wind (feel the burn, baby!!!!)
1  Crater Hellion (board clearing beatstick)
1  Covetous Dragon (Flying lover of artifact hoards)
1  Flowstone Sculpture (Utility creature, who can be hard cast in a pinch)
2  Tidal Kraken (unblockable beatstick)
1  Inferno (another way to clear the board and close the game)
2  Phyrexian Colossus (Another incredible beatstick)
2  Phyrexian War Beast (Cheaper Beatstick, for hard casting in tight spaces)
4  Brainstorm (digging and sorting card)
4  Arcane Denial (Digging and Countering)
4  Power Sink (Countering and mana denial)
3  Sky Diamond (artifact mana)
3  Fire Diamond (as above)
3  Mountain
9  Island
4  Saprazzan Skerry
2  Sandstone Needle
2  Mossfire Valley

This deck is not for the faint of heart, as it has a slow start.  But once you get to the 5+ mana level.  It generates an incredible amount of threats, board leveling, and extra turns.  If you get extra turns and an apurture available, you should be easily able to win the game.  Try it out it is one of the most fun decks that I have played with in a long time.

Shaun Fischer