Changeling Berserker, Wormfang Drake, and Changeling Titan

Prerequisites

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

Results

• Infinite creature ETB
• Infinite creature LTB