This deck was incredibly fun to play so i wanted to share. It's a variation of the Doom Foretold lists, using Teferi's Time Twist instead of the usual artifacts. This makes the deck more inconsistent but enables incredible combinations.

Some combos:

*Might need full control or putting a stop*

Doom Foretold + Teferi's Time Twist on your draw step to cycle a card, get a 2/2 and have it return at the end of turn to bite your opponent. (If your hand is empty you simply draw a card!)

Doom Foretold + Teferi's Time Twist on the opponent's end step makes it skip your turn, so you don't have to sacrifice anything, and then it comes back for them.

These two combos are deceptively strong. They don't expect Doom Foretold to survive as it's your only card on the board so they often play an important card which they end up sacrificing. Meanwhile Doom Foretold survives for another turn and that gives you precious time, since they have to consider doing the same again.

Oath of Kaya + Teferi's Time Twist for an extra Kaya activation. This one helped a lot vs aggressive decks as Teferi's Time Twist can be a dead card in these matchups.

Wishclaw Talisman + Teferi's Time Twist to get any card from your deck, but the Talisman will return to you at the end of turn. Weaker than the rest but still really annoying, if you fetch Teferi you can get a second card for free next turn and bounce the Talisman.

Wishclaw Talisman to fetch Teferi, Time Raveler (that's well known) and bounce it back to your hand for a 4 mana Teferi.

Finally Scholar of the Ages loops with Teferi's Time Twist, as it returns constantly on the board getting you one extra instant or sorcery. You can Agonizing Remorse at their draw step every turn(!) and keep comboing with Scholar locking them out of any outs.

Teferi, Time Raveler + Teferi's Time Twist : Saves Teferi from attacks or removal and returns him at your end step. It's surprisingly strong, as both parts of the combo are protected from instants, and when Teferi returns again they can't easily interact.

I'm pretty sure various improvements can be made. In it's current form it did pretty well in Platinum.

The biggest problem is knowing when and where to put stops, because casting Teferi's Time Twist at the end of a turn makes the card return one turn later, which sometimes can be too late. It's also very common to use Thought Erasure and Teferi's Time Twist at draw steps, and I've made mistakes way too many times with that. For example i had Teferi, Time Raveler +1, Doom Foretold triggered drawing me Thought Erasure and i hadn't put a stop so they drew and entered main phase before i could use it. Similar things happened constantly.

Edit 21/12/19: Made it to Diamond! As expected the simic flash matchup is nearly impossible to beat.

Made some changes and improvements, added a sideboard. Will try Brazen Borrower tomorrow.

Edit 16/1/20: Various Theros changes. Haven't tested yet.