Echocasting Symposium + Time Walk + Zealous Lorecaster

Echocasting Symposium

Time Walk

Zealous Lorecaster

How it works

1. Cast Time Walk 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 Zealous Lorecaster
4. When the Zealous Lorecaster token enters, it triggers, returning Time Walk from your graveyard to your hand.
5. Repeat.