Changeling Titan, Lagrella, the Magpie, and Werefox Bodyguard

Prerequisites

• Changeling Titan in hand or on the battlefield or in exile
• Lagrella, the Magpie in hand or on the battlefield or in exile
• Werefox Bodyguard in hand or on the battlefield or in exile
• plus the mana cost of the creature in your hand available

Steps

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

Results

• Infinite creature ETB
• Infinite creature LTB