Felidar Guardian, and Dominion Saboteur

Prerequisites

• Felidar Guardian on the battlefield
• Dominion Saboteur in hand
• available

Steps

1. Cast Dominion Saboteur by paying its mana cost, choosing to have it enter the battlefield as a copy of Felidar Guardian When Dominion Saboteur enters the battlefield, it triggers, blinking Felidar Guardian
2. When Felidar Guardian enters the battlefield, it triggers, blinking Dominion Saboteur
3. Choose to have Dominion Saboteur enter the battlefield as a copy of Felidar Guardian
4. Repeat from step 2

Results

• Infinite creature ETB
• Infinite creature LTB