Deck list below, I ran this the other week at FNM and it worked quite well, what are you opinions on it? I have the running Idea of having treasure cruise and erase in the sideboard along with other answer cards.
(apologies for not knowing how to format it to look better)
It's definitely interesting, but I'm curious about the inclusion of Purphoros and Sarkhan. There really isn't enough creature generation to make Purphoros worth it, and Sarkhan seems a lot worse than Elspeth would be in this deck. Honestly, I think either bump the Rabblemaster to a 4 of, or 3 + Elspeth.
Purphoros: because of the infinite combo of the midnight guard returning the thopter means purphoros activates every time you replay that thopter for free, such as the altar would mill.
Sarkhan: he is there as he's an immediate threat the instant he hits the field and his ultimate lets you just draw your deck until you find your stuff.
(apologies for not knowing how to format it to look better)
IDK but it looks good
Spells
Artifacts
Creatures
Other
LANDS
Turn 1
Land (any land non-tap)
Springleaf drum
ornithopter
tap drum and thopter to play Altar
Turn 2
Land (any non-tap)
tap drum and thopter for midnight guard
Turn 3
retraction helix the guard
tap guard to return the thopter
play thopter
rinse repeat
Sarkhan: he is there as he's an immediate threat the instant he hits the field and his ultimate lets you just draw your deck until you find your stuff.