Echocasting Symposium + Returned Pastcaller + Temporal Manipulation

Echocasting Symposium

Returned Pastcaller

Temporal Manipulation

How it works

1. Cast Temporal Manipulation 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 Returned Pastcaller
4. When the Returned Pastcaller token enters, it triggers, returning Temporal Manipulation from your graveyard to your hand.
5. Repeat.

By casting Temporal Manipulation, you secure the extra turns needed to get this engine rolling. The secret to sustaining it lies in Echocasting Symposium, whose paradigm ability repeatedly conjures free copies of itself from exile at the start of your main phases to clone creatures. Each time that token copy of Echocasting Symposium enters and creates a Returned Pastcaller, the bird's triggered ability lets you fish Temporal Manipulation right back out of your graveyard. This creates an unstoppable, self-perpetuating loop of extra turns that locks your opponents out of the game entirely.