Time Sieve, and Inquisitor Eisenhorn

Prerequisites

• Time Sieve on the battlefield
• Inquisitor Eisenhorn on the battlefield
• Inquisitor Eisenhorn has at least 5 power each turn
• Inquisitor Eisenhorn cannot be blocked and killed by an opponent
• Inquisitor Eisenhorn does not have summoning sickness

Steps

1. Declare Inquisitor Eisenhorn as an attacker
2. Inquisitor Eisenhorn deals combat damage, triggering itself, investigating at least five times
3. Activate Time Sieve by tapping it and sacrificing five Clue tokens, causing you to take an extra turn after this one

Results

• Infinite turns