I liked Vesuvan Duplimancy in a combo with Expedited Inheritance and cheap red burn spells, but some lists have popped up pushing into green for Outcaster Trailblazer mass copies. Wanted to tinker with the idea.
The basic idea is to get Duplimancy and Trailblazer out, and then cast a 1-mana spell at Trailblazer. Duplimancy triggers and you get a Trailblazer copy, which generates a mana and draws a card, maybe more than one, and you loop from there until you draw your library.
To finish you can Song of Totentanz to haste all the Trailblazer copies. Maybe Urabrask
can ping the opponent out as you're casting spells.
Pretty much there's nothing else the deck can do. If you don't get the combo out, you're hoping to stall as long as possible with weak defense cards.
So a lot of the 1-mana spells have to be cantrips like Timely Interference or Take the Fall or Fading Hope so that you're always digging. Invasion of Ixalan
digs. Otherworldly Gaze digs.
A few spells are for protecting the Trailblazer. Slip Out the Back, March of Swirling Mist.
Lier, Disciple of the Drowned can recycle your spells if you've got the combo started but are low on cards in hand.
Overall I think it's not a good place for a deck to be to require a turn 5 two-card combo for its only win condition, but the combo is kinda fun when it kicks in.
