Blasting Station + Dualcaster Mage + Black Sun's Twilight

Blasting Station

Dualcaster Mage

Black Sun's Twilight

How it works

1. Cast Black Sun's Twilight by paying 5
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it and Blasting Station trigger, with Dualcaster Mage targeting Black Sun's Twilight.
4. Resolve the Blasting Station trigger, untapping it.
5. Holding priority, activate Blasting Station by tapping it and sacrificing Dualcaster Mage.
6. Resolve the Dualcaster Mage trigger, copying Black Sun's Twilight
7. Resolve the Black Sun's Twilight copy, returning Dualcaster Mage from your graveyard to the battlefield.
8. Repeat from step 3.