Ashnod the Uncaring + Corridor Monitor + Goblin Engineer + Lotus Petal

UBR identity

Commander legal

The 4 combo pieces

What must be in place

Goblin Engineer does not have summoning sickness.

How to execute it

  1. Activate Lotus Petal by tapping and sacrificing it, adding {R}.
  2. Activate Goblin Engineer by paying {R}, tapping and sacrificing Corridor Monitor, targeting Lotus Petal.
  3. Ashnod triggers, copying Goblin Engineer's ability, targeting Corridor Monitor.
  4. Resolve the first Goblin Engineer ability, returning Corridor Monitor from your graveyard to the battlefield.
  5. Corridor Monitor enters the battlefield, untapping Goblin Engineer.
  6. Resolve the second Goblin Engineer ability, returning Commander Sphere from your graveyard to the battlefield.
  7. Repeat.

What the combo produces