How can you create a combo with Carth the Lion, Wrenn and Realmbreaker, Lotus Petal, Oath of Teferi?
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[START OF COMBO]This combo can be formed with Carth the Lion, Wrenn and Realmbreaker, Lotus Petal, Oath of Teferi

Color identity: GWUB
Mana cost: 
Steps:
  1. Activate Wrenn and Realmbreaker's first loyalty ability by putting two loyalty counters on it, causing a land you control to become a 3/3 Elemental in addition to its other types.
  2. Activate Wrenn and Realmbreaker's third loyalty ability by removing six loyalty counters from it, causing you to get an emblem.
  3.  Cast Lotus Petal from your graveyard by paying {0}.
  4. Activate Lotus Petal by tapping and sacrificing it, adding one mana of any color.
  5. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite casts of permanent spells in your graveyard
  - Infinite colored mana
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Carth the Lion must be on the battlefield
  - Wrenn and Realmbreaker must be on the battlefield
  - Lotus Petal must be in the graveyard
  - Oath of Teferi must be on the battlefield
  - Wrenn and Realmbreaker has at least four loyalty counters on it.
[END OF COMBO PREREQUISITES]
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