Mikaeus, the Unhallowed, Phyrexian Altar, and Hovel Hurler

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Phyrexian Altar on the battlefield
• Hovel Hurler on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Hovel Hurler
2. When Hovel Hurler dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect
3. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite colored mana
• Infinite death triggers
• Infinite sacrifice triggers
• Infinitely powerful creatures you control until end of turn