Missy + Skirk Alarmist + Intruder Alarm + Phyrexian Altar

Prerequisites

• You control another nontoken nonartifact creature.

Steps

1. 1Activate Phyrexian Altar by sacrificing another nontoken nonartifact creature, adding one mana of any color.
2. 2When the creature dies, Missy's first ability triggers, returning the creature from your graveyard to the battlefield face down as a 2/2 Cyberman artifact creature.
3. 3When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
4. 4Activate Skirk Alarmist by tapping it, turning the creature face up.
5. 5Repeat.

Effects

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