How can you create a combo with Soul of Windgrace, Waves of Aggression, Klauth, Unrivaled Ancient?
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[START OF COMBO]This combo can be formed with Soul of Windgrace, Waves of Aggression, Klauth, Unrivaled Ancient

Color identity: BRGW
Mana cost: 
Steps:
  1. Declare Klauth and Soul of Windgrace as attackers, triggering their abilities.
  2. Resolve the Klauth trigger, adding at least {7}{R/W}{R/W} that can only be spent to cast spells.
  3. Resolve the Soul of Windgrace trigger, returning a land card from your graveyard to the battlefield tapped.
  4. Move to your postcombat main phase.
  5. Cast Waves of Aggression from your graveyard for its retrace cost by paying {3}{R/W}{R/W} and discarding a land card, causing you to untap all creatures that attacked this turn, and to get an additional combat and main phase after this one.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana that can only be spent to cast spells
  - Infinite combat phases
  - Infinite magecraft triggers
  - Infinite self-discard triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Soul of Windgrace must be on the battlefield
  - Waves of Aggression must be in the graveyard
  - Klauth, Unrivaled Ancient must be on the battlefield
  - An opponent cannot block and kill Klauth or Soul of Windgrace.
  - Soul of Windgrace does not have summoning sickness.
  - You have at least one land card in your graveyard.
[END OF COMBO PREREQUISITES]
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