Mikaeus, the Unhallowed, Blood Pet, Hex Parasite, and Sifter of Skulls

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Blood Pet on the battlefield
• Hex Parasite on the battlefield
• Sifter of Skulls 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 Sifter of Skulls 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 Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion creature token
5. Activate the Eldrazi Scion by 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