How can you create a combo with Fertilid, Crystalline Crawler, Avenger of Zendikar, Ancient Greenwarden, Xenograft?
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[START OF COMBO]This combo can be formed with Fertilid, Crystalline Crawler, Avenger of Zendikar, Ancient Greenwarden, Xenograft

Color identity: GU
Mana cost: {1}{G}
Steps:
  1. Activate Fertilid by paying {1}{G} and removing a +1/+1 counter from it, causing you to search your library for a basic land card and put it onto the battlefield tapped.
  2. When the land enters the battlefield, Avenger of Zendikar's second ability triggers twice, putting two +1/+1 counters on each creature you control.
  3. Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding {1}{G}.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Put all basic lands from your library onto the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Fertilid has at least one +1/+1 counter on it.
  - "Plant" chosen with Xenograft.
[END OF COMBO PREREQUISITES]
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