Echocasting Symposium + Eternal Witness + Time Warp

Prerequisites

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Steps

1. 1Cast Time Warp by paying its mana cost, causing you to take an extra turn after this one.
2. 2Move 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. 3Resolve the copy, creating a token copy of Eternal Witness
4. 4When the Eternal Witness token enters, it triggers, returning Time Warp from your graveyard to your hand.
5. 5Repeat.

Effects

• Infinite turns
• Lock