Nim Deathmantle, Ashnod's Altar, and Sprouting Thrinax

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Sprouting Thrinax on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Sprouting Thrinax, adding
2. When Sprouting Thrinax dies, it and Nim Deathmantle trigger, Resolve the Sprouting Thrinax trigger, creating three creature tokens
3. Holding priority, activate Ashnod's Altar by sacrificing a creature token, adding
4. Resolve the Nim Deathmantle trigger, causing you to pay to return Sprouting Thrinax from your graveyard to the battlefield and attach Nim Deathmantle to it
5. Repeat

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers