Deadeye Navigator, Relic of Legends, and Heartstone

Prerequisites

• Deadeye Navigator on the battlefield
• Relic of Legends on the battlefield
• Heartstone on the battlefield

Steps

1. Activate Relic of Legends' second ability by tapping the legendary creature that's paired with Deadeye Navigator, adding
2. Activate the legendary creature by paying due to Heartstone, blinking it
3. When the legendary creature enters, Deadeye Navigator's soulbond ability triggers, repairing the legendary creature and Deadeye Navigator
4. Repeat

Results

• Infinite ETB
• Infinite LTB