Hoard Robber, Time Sieve, Academy Manufactor, and Undercover Operative

Prerequisites

• Hoard Robber on the battlefield
• Time Sieve on the battlefield
• Academy Manufactor on the battlefield
• Undercover Operative on the battlefield
• Undercover Operative is a copy of Academy Manufactor
• Hoard Robber does not have summoning sickness and cannot be blocked by at least one opponent

Steps

1. Attack with Hoard Robber
2. Hoard Robber triggers on combat damage to a player, creating three Treasure tokens, three Food tokens, and three Clue tokens
3. Activate Time Sieve's ability by tapping Time Sieve and sacrificing five artifacts you control, taking an extra turn after this one
4. Repeat

Results

• Infinite turns