Transmutation Font + Timestream Navigator + Academy Manufactor + Kuldotha Forgemaster + Machine God's Effigy

Transmutation Font

Timestream Navigator

Academy Manufactor

Kuldotha Forgemaster

Machine God's Effigy

How it works

1. Activate Transmutation Font's first ability by tapping it, creating a Food, a Clue and a Treasure token.
2. Activate Kuldotha Forgemaster by tapping it, sacrificing the Food, the Clue and the Treasure, putting Machine God's Effigy from your library onto the battlefield.
3. If you don't have the city's blessing, Machine God's Effigy gives you the city's blessing.
4. Activate Machine God's Effigy by paying 2, tapping it and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
5. Repeat each turn.