Wormfang Drake, Changeling Titan, and Lagrella, the Magpie

Prerequisites

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

Results

• Infinite creature ETB
• Infinite creature LTB