Cast Time Warp by paying its mana cost, causing you to take an extra turn after this one.
Cast Ephemerate by paying , blinking Greenwarden of Murasa and exiling Ephemerate.
When Greenwarden of Murasa enters, it triggers, returning Time Warp from your graveyard to your hand.
Move to your next turn. At the beginning of your upkeep, Ephemerate's rebound ability triggers, causing you to cast it from exile without paying its mana cost.
Resolve Ephemerate, blinking Greenwarden of Murasa.
When Greenwarden of Murasa enters, it triggers, returning Ephemerate from your graveyard to your hand.
Repeat.
This elegant loop revolves around abusing Greenwarden of Murasa's entry trigger to continuously recycle your spells, with Ephemerate serving as the recurring blink engine that keeps the chain alive. Each time Ephemerate enters the fray—initially hardcast and later courtesy of its rebound ability—Greenwarden of Murasa fetches the key resources right back to your hand. This allows you to effortlessly replay Time Warp turn after turn, trapping your opponents in an endless succession of extra turns while recycling Ephemerate endlessly from the graveyard.