Xavier Sal, Infested Captain + Saproling Burst + Intruder Alarm

Prerequisites

• Xavier Sal does not have summoning sickness.
• Saproling Burst has at least two fade counters on it.

Steps

1. 1Activate Saproling Burst by removing a fade counter from it, creating a */* Saproling creature token.
2. 2When the Saproling enters the battlefield, Intruder Alarm triggers, untapping all creatures.
3. 3Activate Xavier Sal's second ability by tapping it and sacrificing the Saproling, putting a fade counter on Saproling Burst.
4. 4Repeat.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite proliferate
• Infinite untap of creatures