How can you create a combo with Horseshoe Crab, Cryptolith Rite, Leyline of Abundance?
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[START OF COMBO]This combo can be formed with Horseshoe Crab, Cryptolith Rite, Leyline of Abundance

Color identity: GU
Mana cost: 
Steps:
  1. Activate Horseshoe Crab's ability from Cryptolith Rites by tapping it, adding {U}.
  2. Leyline of Abundance's second ability triggers, adding {G}.
  3. Activate Horseshoe Crab's own ability by paying {U}, untapping it.
  4. Repeat any number of times.
  5. Once you have infinite green mana, you may activate Leyline of Abundance's last ability any number of times.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on all creatures you control
  - Infinite green mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Horseshow Crab does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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