Yahenni, Undying Partisan, Wormfang Drake, and Sun Titan

Prerequisites

• Yahenni, Undying Partisan on the battlefield
• Wormfang Drake in hand
• Sun Titan on the battlefield
• available

Steps

1. Cast Wormfang Drake by paying its mana cost
2. When Wormfang Drake enters, its first ability triggers, exiling Sun Titan
3. Activate Yahenni by sacrificing Wormfang Drake
4. When Wormfang Drake dies, its second ability triggers, returning Sun Titan from exile to the battlefield
5. When Sun Titan enters, it triggers, returning Wormfang Drake from your graveyard to the battlefield
6. When Wormfang Drake enters, its first ability triggers, exiling Sun Titan
7. Resolve the Yahenni ability
8. Repeat from step 3

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers