Phyrexian Altar, Geth's Summons, and Archaeomancer

Prerequisites

• Phyrexian Altar on the battlefield
• Geth's Summons in hand
• Archaeomancer in the graveyard
• At least three opponents have at least three poison counters each and at least one creature card each in their graveyards
• available

Steps

1. Cast Geth's Summons by paying , returning Archaeomancer from your graveyard and three creatures from opponents' graveyards to the battlefield under your control
2. Archaeomancer triggers, returning Geth's Summons from your graveyard to your hand
3. Activate Phyrexian Altar four times by sacrificing all four creatures you returned in step 1, adding
4. Repeat

Results

• Infinite blinking of creatures in opponent's graveyards
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers