Gandalf the White + Ancestral Statue + Clock of Omens + Empowered Autogenerator

Gandalf the White

Ancestral Statue

Clock of Omens

Empowered Autogenerator

How it works

1. Activate Empowered Autogenerator by tapping it, putting a charge counter on it and adding at least 4.
2. Cast Ancestral Statue by paying 4.
3. When Ancestral Statue enters the battlefield, it triggers twice.
4. Holding priority, activate Clock of Omens by tapping the nontoken noncreature artifact and Ancestral Statue, untapping Empowered Autogenerator.
5. Resolve both Ancestral Statue triggers, returning it and the nontoken noncreature artifact to your hand.
6. Cast the noncreature artifact by paying its mana cost.
7. Repeat.