4-Color Flicker Control with 5-Color sideboarding. Features plenty of removal and tricks to stop whatever your opponent throws at it. Bring out the gearhulks for the win-con.
Mainboard
Panharmonicon: Doubles all the ETB effects in the deck, making for some very annoying combos.Cloudblazer: A broken card while Panharmonicon is on the field, and a solid card otherwise. A flyer, lifegain, and 2 draws! Lets make than 4 draws, or 6.
Fairgrounds Warden: The non flash version of Stasis Snare.
Filigree Familiar: Solid lifegain, and some draw power to find a Panharmonicon.
Servant of the Conduit: Mana fixing. Never can have too much.
Verdurous Gearhulk: 8/8 trample, or maybe 6/6 and a 4/4?
Noxious Gearhulk: Removal, lifegain, and a 5/4 with menace. What is not to love about this card? Did you forget the removal and lifegain gets doubled with Panharmonicon on the field?
Sideboard
Angelic Gift: Fliers? No problem.
Bonds of Mortality: Because screw angel decks.
Declaration in Stone: Remove their win-con
Fumigate: Deck can be weak vs wide, this takes care of that.
Radiant Flames: Best removal spell for a 4+ color deck.
Stasis Snare: In case the Wardens aren't enough.
Welding Sparks: More removal, decent amount of artifacts.
Might bring in some cards to destroy Artifacts/Enchantments.