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

Color identity: U
Mana cost: {U}{U}
Steps:
  1. Activate Dreamstone Hedron's first ability by tapping it, adding {C}{C}{C}.
  2. Cast Echo Storm by paying {3}{U}{U}, 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 Dreamstone Hedron.
  4. Resolve all copies of Echo Storm, creating that many token copies of Dreamstone Hedron.
  5. Resolve the original Echo Storm, creating a token copy of Rod of Absorption and exiling Echo Storm due to Rod of Absorption.
  6. Activate two Dreamstone Hedron tokens' first abilities by tapping them, adding six {C}.
  7. 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.
  8. Repeat from step 3.
  9. Once you have infinite mana, you may target any other artifact you control using Echo Storm, or sacrifice the Dreamstone Hedron tokens to draw infinite cards.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - 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
  - Dreamstone Hedron must be on the battlefield
  - You've cast your commander from the command zone at least twice.
[END OF COMBO PREREQUISITES]
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