Mikaeus, the Unhallowed, Blood Pet, Hex Parasite, and Pitiless Plunderer

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Blood Pet on the battlefield
• Hex Parasite on the battlefield
• Pitiless Plunderer on the battlefield
• Blood Pet does not have a +1/+1 counter on it

Steps

1. Activate Blood Pet by sacrificing it, adding
2. When Blood Pet dies, its undying ability and Pitiless Plunderer trigger
3. Resolve the Blood Pet trigger, returning it to the battlefield from your graveyard with a +1/+1 counter on it
4. Resolve the Pitiless Plunderer trigger, creating a Treasure token
5. Activate the Treasure by tapping and sacrificing it, adding
6. Activate Hex Parasite by paying and removing the +1/+1 counter from Blood Pet, giving Hex Parasite +1/+0 until end of turn
7. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinitely powerful Hex Parasite until end of turn
• Infinite sacrifice triggers