This devious win condition relies on meticulously clearing your own board to fulfill Barren Glory's notoriously strict requirement for a solitary existence during your upkeep. By casting Renounce right before your turn begins, you can instantly sacrifice every other permanent you control to trigger a massive burst of life. With your hand already empty and your board reduced to just the enchantment itself, Barren Glory's upkeep trigger resolves uncontested to instantly claim victory.