Time Sieve, Tamiyo's Journal, Academy Manufactor, and Double Major

Prerequisites

• Time Sieve on the battlefield
• Tamiyo's Journal on the battlefield
• Academy Manufactor in hand
• Double Major in hand
• You control at least five additional artifacts
• available

Steps

1. Cast Academy Manufactor by paying
2. Holding priority, cast Double Major by paying , copying Academy Manufactor
3. Resolve both Academy Manufactor spells
4. Activate Time Sieve by tapping it and sacrificing five artifacts, causing you to take an extra turn after this one
5. Move to your next turn
6. At the beginning of your upkeep, Tamiyo's Journal triggers, creating three Food, three Clue, and three Treasure tokens
7. Repeat from step 4

Results

• Infinite turns