Pir, Imaginative Rascal + Sporoloth Ancient + Tainted Observer + Ashnod's Altar

Prerequisites

• You control a creature with at least three spore counters on it.

Steps

1. 1Activate a creature you control by removing two spore counters from it, creating a 1/1 Saproling creature token.
2. 2The Saproling enters the battlefield, triggering Tainted Observer.
3. 3Holding priority, activate Ashnod's Altar by sacrificing the Saproling, adding .
4. 4Resolve the Tainted Observer trigger, causing you to pay to put two spore counters on any creature you control.
5. 5Repeat.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite proliferate