Mazirek, Kraul Death Priest, Putrid Goblin, and Ashnod's Altar

Prerequisites

• Mazirek, Kraul Death Priest on the battlefield
• Putrid Goblin on the battlefield
• Ashnod's Altar on the battlefield
• Putrid Goblin does not have a -1/-1 counter on it

Steps

1. Activate Ashnod's Altar by sacrificing Putrid Goblin, adding
2. Putrid Goblin dies, triggering its persist ability and Mazirek
3. Resolve the Putrid Goblin trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. Resolve the Mazirek trigger, putting a +1/+1 counter on each creature you control
5. Repeat

Results

• Infinite +1/+1 counters on all creatures you control except Putrid Goblin
• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers