This is my premodern brew, after weeks of tinkering and trying to get a viable Doomsday deck together.
This is inspired by legacy Doomsday lists that use Experimental Frenzy to go infinite with LEDs, Tendrils, and two Doomsdays. Similarly, you can go infinite with a Future Sight in play--looping free mana, Ebony Charm to drain the opponent for 1, and two Doomsdays to loop for infinite castings of Ebony Charm.
Games typically play out in one of two ways--either jamming a quick Doomsday and casting Future Sight with LED+cantrip on the next turn, or by jamming Future Sight asap and getting incredible card advantage off of it. Either by seeing lots of cards or by setting up a kill with Lim-Dul's Vault, it generally takes little time to do so.
Piles are usually pretty intuitive, since every pile needs a Doomsday and Ebony Charm--and +90% of piles need an LED as well. Here are some common set-ups:
- Future Sight in play: Petal, LED, Doomsday, Ebony Charm, X--win for no mana post-Doomsday
- LED+Chromatic Sphere: Future Sight, LED, Petal, Doomsday, Ebony Charm--win for 2 mana post-Doomsday
- 2x Chromatic Sphere: LED, Future Sight, LED, Doomsday, Ebony Charm--win for 2 mana post-Doomsday
Pass-the-turn piles:
- 5 non-LED mana: Future Sight, LED, Petal, Doomsday, Ebony Charm--win for no mana post-Doomsday
- LED in play: Sleight, Ebony Charm Future Sight, LED, Doomsday--win for 2 mana post-Doomsday
- Sleight of Hand/Sphere: LED, Future Sight, LED, Doomsday, Ebony Charm--win for 2 mana post-Doomsday with Sphere in play, 3 with Sleight
Of course, if you have an extra LED or Petal available, you can replace a card in the pile with a Duress (or bounce spell post-board) in order to have some protection available. A common post-board tactic is to create pass-the-turn piles with a sideboard answer as the top card, draw and cast it, then go off.
As you can see, you're generally setting up a Future Sight into Doomsday (Lim-Dul's Vault can often serve as a double or triple Vampiric Tutor in that regard), or a Doomsday into Future Sight. It's tricky, but not as tricky as Doomsday decks have historically been.
The loop is of course quite vulnerable to a wide swath of hate. Grave hate interrupts the loop. Enchantment removal or bounce can stop the combo. Sphere-effects and sufficient mana denial can keep you from going off. Instant-speed damage kills you when you are oscillating between 1 and 2 life as you loop.
