Nim Deathmantle, Phyrexian Altar, and Hallowed Spiritkeeper

Prerequisites

• Nim Deathmantle on the battlefield
• Phyrexian Altar on the battlefield
• Hallowed Spiritkeeper on the battlefield
• available

Steps

1. Activate Phyrexian Altar by sacrificing Hallowed Spiritkeeper, adding
2. Hallowed Spiritkeeper dies, triggering itself and Nim Deathmantle
3. Resolve the Hallowed Spiritkeeper trigger, creating at least four 1/1 Spirit creature tokens
4. Activate Phyrexian Altar three times by sacrificing three Spirits, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return Hallowed Spiritkeeper from your graveyard to the battlefield, and attach Nim Deathmantle to it
6. Repeat

Results

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