How can you create a combo with Rod of Absorption, Echo Storm, Chromatic Orrery?
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[START OF COMBO]This combo can be formed with Rod of Absorption, Echo Storm, Chromatic Orrery

Color identity: U
Mana cost: 
Steps:
  1. Activate Chromatic Orrery's first ability by tapping it, adding {5}.
  2. Cast Echo Storm by paying {5}, targeting Rod of Absorption.
  3. Echo Storm triggers, copying itself for each time you've cast your commander from the command zone this game, with each copy targeting Chromatic Orrery.
  4. Resolve the first copy of Echo Storm, creating a token copy of Chromatic Orrery.
  5. Put the tapped Chromatic Orrery into your graveyard due to the legend rule.
  6. Activate the remaining Chromatic Orrery's first ability by tapping it, adding {5}.
  7. Repeat from step 4 for each remaining copy, if applicable.
  8. Resolve the original Echo Storm, creating a token copy of Rod of Absorption and exiling Echo Storm due to Rod of Absorption.
  9. Activate the original Rod of Absorption by paying {5}, tapping and sacrificing it, causing you to cast Echo Storm from exile without paying its mana cost, targeting the Rod of Absorption token.
  10. Repeat from step 3.
  11. If you have cast your commander from the command zone two or more times this game, this combo nets infinite mana, and you may instead use Chromatic Orrery's second ability to draw infinite cards and/or target any other artifact you control using Echo Storm.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite copies of artifacts you control
  - Infinite draw triggers
  - Infinite magecraft triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Rod of Absorption must be on the battlefield
  - Echo Storm must be in your hand
  - Chromatic Orrery must be on the battlefield
  - You've cast your commander from the command zone at least once.
[END OF COMBO PREREQUISITES]
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