Brago, King Eternal, Glorious Protector, and Icewind Stalwart

Prerequisites

• Brago, King Eternal on the battlefield
• Glorious Protector on the battlefield
• Icewind Stalwart in exile

Steps

1. Deal combat damage to an opponent using Brago
2. Brago triggers, blinking Glorious Protector
3. Glorious Protector leaves and enters the battlefield, returning Icewind Stalwart from exile to the battlefield, and triggering both Icewind Stalwart and Glorious Protector's enters-the-battlefield abilities
4. Resolve the Glorious Protector trigger, exiling Icewind Stalwart until Glorious Protector enters the battlefield
5. Resolve the Icewind Stalwart trigger, blinking Glorious Protector
6. Repeat from step 3

Results

• Infinite blinking of Glorious Protector and non-Angel creatures you control
• Infinite ETB
• Infinite LTB