Echocasting Symposium + Skullwinder + Time Warp

Echocasting Symposium

Skullwinder

Time Warp

How it works

1. Cast Time Warp by paying its mana cost, causing you to take an extra turn after this one.
2. Move to your next turn. At the beginning of your precombat main phase, Echocasting Symposium's paradigm ability triggers, causing you to cast a copy of it from exile.
3. Resolve the copy, creating a token copy of Skullwinder
4. When the Skullwinder token enters, it triggers, returning Time Warp from your graveyard to your hand.
5. Repeat.

By leveraging Echocasting Symposium's paradigm ability to repeatedly cast copies of it for free on your main phases, you can systematically copy Skullwinder every single turn. Each time the Skullwinder token enters the battlefield, its triggered ability lets you fish Time Warp right back out of your graveyard to your hand. Because Time Warp grants you an endless sequence of extra turns, this loop lets you continuously replay the sorcery and recur it forever, locking opponents out of the game while you take every turn.