Athreos, Shroud-Veiled, Resourceful Defense, and Ashnod's Altar

Prerequisites

• Athreos, Shroud-Veiled on the battlefield
• Resourceful Defense on the battlefield
• Ashnod's Altar on the battlefield
• You control at least two creatures
• At least one creature has coin counter on it

Steps

1. Activate Ashnod's Altar by sacrificing a creature with coin counter, adding
2. Athreos and Resourceful Defense triggers
3. Resolve the Athreos trigger, returning that creature to the battlefield
4. Resolve the Resourceful Defense trigger, putting a coin counter on other creature you control
5. Repeat

Results

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