Umbral Collar Zealot, Felidar Guardian, and Rescue Skiff

Prerequisites

• Umbral Collar Zealot on the battlefield
• Felidar Guardian in hand
• Rescue Skiff on the battlefield
• available

Steps

1. Cast Felidar Guardian by paying its mana cost
2. When Felidar Guardian enters the battlefield, it triggers, targeting Rescue Skiff Holding priority, activate Umbral Collar Zealot by sacrificing Felidar Guardian
3. Resolve the Felidar Guardian ability, blinking Rescue Skiff When Rescue Skiff enters, it triggers, returning Felidar Guardian from your graveyard to the battlefield
4. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite surveil 1