Lena, Selfless Champion, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Lena, Selfless Champion on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• You conrtol at least one additional nontoken creature
• available

Steps

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

Results

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