How can you create a combo with Ashnod the Uncaring, Goblin Engineer, Corridor Monitor, Commander's Sphere?
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[START OF COMBO]This combo can be formed with Ashnod the Uncaring, Goblin Engineer, Corridor Monitor, Commander's Sphere

Color identity: UBR
Mana cost: 
Steps:
  1. Activate Commander's Sphere's first ability by tapping it, adding {R}.
  2. Activate Commander's Sphere's second ability by sacrificing it, causing you to draw a card.
  3. Activate Goblin Engineer by paying {R}, tapping and sacrificing Corridor Monitor, targeting Commander's Sphere.
  4. Ashnod triggers, copying Goblin Engineer's ability, targeting Corridor Monitor.
  5. Resolve the first Goblin Engineer ability, returning Corridor Monitor from your graveyard to the battlefield.
  6. Corridor Monitor enters the battlefield, untapping Goblin Engineer.
  7. Resolve the second Goblin Engineer ability, returning Commander Sphere from your graveyard to the battlefield.
  8. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers
  - Near-infinite death triggers
  - Near-infinite enters the battlefield
  - Near-infinite leaves the battlefield
  - Near-infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Goblin Engineer does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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