Nim Deathmantle, Ashnod's Altar, and Grave Titan

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Grave Titan on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Grave Titan, adding
2. Grave Titan dies, triggering Nim Deathmantle, causing you to pay to return Grave Titan from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. Grave Titan enters the battlefield, creating two 2/2 Zombie creature tokens
4. Activate Ashnod's Altar by sacrificing a Zombie, adding
5. Repeat

Results

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