Wormfang Drake, Fiend Hunter, and Changeling Titan

Prerequisites

• Wormfang Drake in hand or on the battlefield or in exile
• Fiend Hunter in hand or on the battlefield or in exile
• Changeling Titan in hand or on the battlefield or in exile
• plus the mana cost of the creature in your hand available

Steps

1. Cast Wormfang Drake for its mana cost
2. When Wormfang Drake enters, it exiles Fiend Hunter until Wormfang Drake leaves the battlefield
3. Resolve any additional effects of Wormfang Drake's ETB
4. When Fiend Hunter leaves the battlefield, Changeling Titan is returned from exile to the battlefield
5. When Changeling Titan enters, it exiles Wormfang Drake until Changeling Titan leaves the battlefield
6. Resolve any additional effects of Changeling Titan's ETB
7. When Wormfang Drake leaves the battlefield, Fiend Hunter is returned from exile to the battlefield
8. When Fiend Hunter enters, it exiles Changeling Titan until Fiend Hunter leaves the battlefield
9. Resolve any additional effects of Fiend Hunter's ETB
10. When Changeling Titan leaves the battlefield, Wormfang Drake is returned from exile to the battlefield
11. Repeat from step 2

Results

• Infinite creature ETB
• Infinite creature LTB