Lady Octopus, Inspired Inventor + Ancestral Statue + Intruder Alarm

Lady Octopus, Inspired Inventor

Ancestral Statue

Intruder Alarm

How it works

1. Activate Lady Octopus by tapping it, causing you to cast Ancestral Statue without paying its mana cost.
2. When Ancestral Statue enters, it and Intruder Alarm trigger.
3. Resolve the Ancestral Statue trigger, returning it from the battlefield to your hand.
4. Resolve the Intruder Alarm trigger, untapping all creatures.
5. Repeat.
6. Activate all mana-producing creatures you control by tapping them, adding at least 5.
7. Cast Ancestral Statue by paying 4.
8. Ancestral Statue enters the battlefield, triggering itself and Intruder Alarm.
9. Resolve the Ancestral Statue trigger, returning it from the battlefield to your hand.
10. Resolve the Intruder Alarm trigger, untapping all creatures.
11. Repeat.