Necrogenesis, Void Attendant, Ashnod's Altar, and Chromatic Orrery

Prerequisites

• Necrogenesis on the battlefield
• Void Attendant on the battlefield
• Ashnod's Altar on the battlefield
• Chromatic Orrery on the battlefield
• An opponent has a creature card in their graveyard
• available

Steps

1. Activate Necrogenesis by paying , exling a creature card from an opponent's graveyard and creating a 1/1 Saproling creature token
2. Activate Ashnod's Altar by sacrificing the Saproling, adding
3. Activate Void Attendant by paying and putting a card from an opponent's exile into their graveyard, creating a 1/1 Eldrazi Scion creature token
4. Activate Ashnod's Altar by sacrificing the Eldrazi Scion, adding
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers