How can you create a combo with Uro, Titan of Nature's Wrath, Gwenna, Eyes of Gaea, Myth Unbound, Mirrormade, Ashnod's Altar?
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[START OF COMBO]This combo can be formed with Uro, Titan of Nature's Wrath, Gwenna, Eyes of Gaea, Myth Unbound, Mirrormade, Ashnod's Altar

Color identity: GU
Mana cost: {1}
Steps:
  1. Activate Gwenna by tapping it, adding {G}{U} that can only be spent to cast creature spells or activate abilities of creatures.
  2. Cast Uro from the command zone by paying {1}{G}{U}.
  3. Gwenna triggers, putting a +1/+1 counter on it and untapping itself.
  4. Uro enters the battlefield, triggering its first and second abilities.
  5. Holding priority, activate Ashnod's Altar by sacrificing Uro, adding {C}{C}.
  6. Choose to return Uro to the command zone from your graveyard.
  7. Myth Unbound and Mirrormade each trigger, causing you to draw two cards.
  8. Resolve the first Uro trigger, causing you to not sacrifice Uro due to it no longer being on the battlefield.
  9. Resolve the second Uro trigger, causing you to gain three life, draw a card, and put any land from your hand onto the battlefield.
  10. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers
  - Near-infinite +1/+1 counters on Gwenna
  - Near-infinite colorless mana
  - Near-infinite commander casts
  - Near-infinite death triggers
  - Near-infinite enters the battlefield
  - Near-infinite landfall triggers
  - Near-infinite lifegain
  - Near-infinite lifegain triggers
  - Near-infinite leaves the battlefield
  - Near-infinite sacrifice triggers
  - Near-infinite storm count
  - Pull all lands from your hand and library onto the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Uro, Titan of Nature's Wrath must be in the command zone
  - Gwenna, Eyes of Gaea must be on the battlefield
  - Myth Unbound must be on the battlefield
  - Mirrormade must be on the battlefield
  - Ashnod's Altar must be on the battlefield
  - Gwenna does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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