Ashnod's Altar, Wormfang Drake, and Rescue Skiff

Prerequisites

• Ashnod's Altar on the battlefield
• Wormfang Drake in hand
• Rescue Skiff on the battlefield
• available

Steps

1. Cast Wormfang Drake by paying its mana cost
2. When Wormfang Drake enters, its first ability triggers, exiling Rescue Skiff
3. Activate Ashnod's Altar by sacrificing Wormfang Drake
4. When Wormfang Drake dies, its second ability triggers, returning Rescue Skiff from exile to the battlefield
5. When Rescue Skiff enters, it triggers, returning Wormfang Drake from your graveyard to the battlefield
6. When Wormfang Drake enters, its first ability triggers, exiling Rescue Skiff
7. Repeat from step 3

Results

• Infinite ETB
• Infinite LTB
• Infinite colorless mana
• Infinite death triggers
• Infinite sacrifice triggers