How can you create a combo with Necrotic Ooze, Tree of Redemption, Phyrexian Colossus, Auriok Bladewarden?
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[START OF COMBO]This combo can be formed with Necrotic Ooze, Tree of Redemption, Phyrexian Colossus, Auriok Bladewarden

Color identity: WBG
Mana cost: 
Steps:
  1. Activate Necrotic Ooze using Auriok Bladewarden's ability by tapping it, giving itself +X/+X until end of turn, where X is Necrotic Ooze's power.
  2. Activate Necrotic Ooze using Phyrexian Colossus' ability by paying eight life, untapping it.
  3. Repeat two additional times.
  4. Activate Necrotic Ooze using Tree of Redemption's ability by tapping it, causing you to swap your life total with Necrotic Ooze's toughness.
  5. Activate Necrotic Ooze using Phyrexian Colossus' ability by paying eight life, untapping it.
  6. Activate Necrotic Ooze using Auriok Bladewarden's ability by tapping it, giving itself +X/+X until end of turn, where X is Necrotic Ooze's power.
  7. Activate Necrotic Ooze using Phyrexian Colossus' ability by paying eight life, untapping it.
  8. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinitely large creatures until end of turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Necrotic Ooze must be on the battlefield
  - Tree of Redemption must be in the graveyard
  - Phyrexian Colossus must be in the graveyard
  - Auriok Bladewarden must be in the graveyard
  - Necrotic Ooze does not have summoning sickness.Your life total is at least twenty-five.
[END OF COMBO PREREQUISITES]
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