Changeling Berserker, Changeling Titan, and All-Fates Stalker

Prerequisites

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

Results

• Infinite creature ETB
• Infinite creature LTB