Mikaeus, the Unhallowed + Phyrexian Altar + Moonshadow
Produces: Infinite ETB, Infinite LTB, Infinite colored mana, Infinite death triggers, Infinite sacrifice triggers
- Mikaeus, the Unhallowed
- Phyrexian Altar
- Moonshadow
- Color identity
- B
Steps
- Activate Phyrexian Altar by sacrificing Moonshadow.
- When Moonshadow 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.
- Repeat.