Yannik, Scavenging Sentinel, Wormfang Drake, and Changeling Titan

Prerequisites

• Yannik, Scavenging Sentinel 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 Yannik for its mana cost
2. When Yannik enters, it exiles Wormfang Drake until Yannik leaves the battlefield
3. Resolve any additional effects of Yannik'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 Yannik until Changeling Titan leaves the battlefield
6. Resolve any additional effects of Changeling Titan's ETB
7. When Yannik 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, Yannik is returned from exile to the battlefield
11. Repeat from step 2

Results

• Infinite +1/+1 counters on creatures you control
• Infinite creature ETB
• Infinite creature LTB