Mikaeus, the Unhallowed, Phyrexian Altar, and Glen Elendra Guardian

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Phyrexian Altar on the battlefield
• Glen Elendra Guardian on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Glen Elendra Guardian
2. When Glen Elendra Guardian 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 creature ETB
• Infinite creature LTB
• Infinite colored mana
• Infinite death triggers
• Infinite creature sacrifice triggers