Echocasting Symposium + Returned Pastcaller + Time Walk

Mana needed: {1}{U} each turn

URW identity

The 3 combo pieces

• Echocasting Symposium
• Returned Pastcaller
• Time Walk

How to execute it

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 Returned Pastcaller
4. When the Returned Pastcaller token enters, it triggers, returning Time Walk from your graveyard to your hand.
5. Repeat.

What the combo produces

• Infinite turns
• Lock