This clever loop transforms a mass-drawing spell into a lethal threat by turning every card your opponents draw into poison damage. With Glistening Oil enchanting Razorkin Needlehead, the creature's triggered ability—which normally deals standard damage when an opponent draws—instead infects them with poison counters. When you cast Echo of Eons, your opponents draw seven new cards, triggering Razorkin Needlehead seven times and instantly closing out the game with ten or more poison counters. Best of all, Glistening Oil naturally returns to your hand when it goes to the graveyard, while Echo of Eons can be cast again straight from your graveyard using its flashback cost to keep the cycle going.