Mikaeus, the Unhallowed, Phyrexian Altar, and Tatterkite

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Phyrexian Altar on the battlefield
• Tatterkite on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Tatterkite, adding one mana of any color
2. When Tatterkite dies, its undying ability triggers, returning it to the battlefield from your graveyard with zero +1/+1 counters due to its ability
3. Repeat

Results

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