Copy of: Scary Deck (EDH / Commander)

Disclaimer

This is only nominally a 5-colors deck.
Although there are several ways to generate white mana (and green), I didn't want to play white because it would have pushed towards Esper. Which is like building a Sharuum deck, except that Sharuum isn't your commander, your mana base is worse and, well, your deck is stuffed with nigh-unplayable scarecrows.

Notable Combos

With Goblin Welder + Thornbite Staff and 2 artifact creatures, one in play and the other in the grave, one of them being:

• Triskelion -> infinite damage.
• Wurmcoil Engine/Precursor Golem -> infinite tokens.
• Solemn Simulacrum -> infinite draws plus a bunch of lands.
• Duplicant -> exile all creatures.
• Baleful Strix -> infinite draws.
• Sphinx Summoner -> tutor whatever.
• random scarecrow, with Reaper King in play -> destroy everything.

Scarecrone + Thornbite Staff with:

• Composite Golem -> infinite colored mana.
• Wurmcoil Engine/Precursor Golem + Ashnod's Altar/Krark-Clan Ironworks -> infinite mana and infinite tokens.
• Wingrattle Scarecrow + Ashnod's Altar/Krark-Clan Ironworks + Reaper King -> destroy everything.
  (Scarecrone + Thornbite Staff can be swapped for Nim Deathmantle.)

Metallic Mimic + Wingrattle Scarecrow + Ashnod's Altar/Krark-Clan Ironworks + black creature -> infinite mana.
If the black creature happens to be Reaper King, also destroy everything.

Myr Welder imprinted with:

• Mana Vault + Pili-Pala -> infinite colored mana.
• Mana Vault + Staff of Domination -> infinite whatever.
  (Mana Vault can be swapped for whatever artifact that generate 2 or more mana.)

Staff of Domination + Metalworker with at least 3 artifacts in hand -> infinite mana, then infinite whatever.
Voltaic Construct + Metalworker with at least 2 artifacts in hand -> infinite mana.
Voltaic Construct + Myr Welder imprinted with Mana Vault -> infinite mana.
(Myr Welder can be swapped for Tezzeret.)

Coffin Queen + Thornbite Staff + Composite Golem -> infinite colored mana (not black).

Infinite mana + Staff of Domination -> do stupid things, then win the game somehow.

Attacking with Reaper King + Blade of Selves -> monster blow!
(destroy (N-1)^2 permanents, where N is the number of opponents.)