Charnelhoard Wurm, Klauth, Unrivaled Ancient, and Relentless Assault

Prerequisites

• Charnelhoard Wurm on the battlefield
• Klauth, Unrivaled Ancient on the battlefield
• Relentless Assault in the graveyard
• Charnelhoard Wurm does not have summoning sickness
• Klauth and Charnelhoard Wurm cannot be blocked by an opponent

Steps

1. Declare Charnelhoard Wurm and Klauth as attackers
2. Klauth triggers, adding at least that can only be spent to cast spells
3. Deal combat damage to an opponent using Charnelhoard Wurm
4. Charnelhoard Wurm triggers, returning Relentless Assault from your graveyard to your hand
5. Cast Relentless Assault by paying , causing you to untap all creatures that attacked this turn and to get an additional combat and main phase after this one
6. Repeat

Results

• Infinite colored mana that can only be spent to cast spells
• Infinite combat damage
• Infinite combat phases
• Infinite magecraft triggers
• Infinite storm count