How can you create a combo with Crystalline Crawler, Biogenic Upgrade, Reiterate?
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[START OF COMBO]This combo can be formed with Crystalline Crawler, Biogenic Upgrade, Reiterate

Color identity: RG
Mana cost: {8}{R}{R}{G}{G}
Steps:
  1. Cast Biogenic Upgrade by paying {4}{G}{G}, targeting Crystalline Crawler.
  2. Holding priority, cast Reiterate with buyback by paying {4}{R}{R}, creating a copy of Biogenic Upgrade targeting Crystalline Crawler and returning Reiterate to your hand.
  3. Resolve the copy of Biogenic Upgrade, putting three +1/+1 counters on Crystalline Crawler and then doubling the number of +1/+1 counters on Crystalline Crawler.
  4. Activate Crystalline Crawler's first ability six times by removing six +1/+1 counters from it, adding {4}{R}{R}.
  5. Repeat from step 2.
  6. Once you have infinite mana, you may instead target other creatures using Biogenic Upgrade.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters
  - Infinite colored mana
  - Infinite magecraft triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Crystalline Crawler must be on the battlefield
  - Biogenic Upgrade must be in your hand
  - Reiterate must be in your hand
  - Crystalline Crawler has at least two +1/+1 counters on it.
[END OF COMBO PREREQUISITES]
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