Echocasting Symposium + Eternal Witness + Walk the Aeons

3-card combo · GU

Verdict

Yes — this 3-card loop takes infinite turns in Simic by recycling Walk the Aeons through a free Eternal Witness token every upkeep.

Cards required

Cheapest stack total

$5.13

Color identity

Popularity

4 decks

Format

Commander

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Echocasting Symposium exiles instants and sorceries cast through it, then at the start of each precombat main phase it copies one of them for free — Walk the Aeons qualifies, and the copy creates an Eternal Witness token that immediately returns Walk the Aeons from the graveyard to hand. The loop costs nothing beyond the initial cast of Walk the Aeons and requires all three pieces on the battlefield, making it a tutor-friendly two-card setup once Echocasting Symposium is already in play.

How it works

Prerequisites

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Steps

Cast Walk the Aeons by paying its mana cost, causing you to take an extra turn after this one.
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.
Resolve the copy, creating a token copy of Eternal Witness
When the Eternal Witness token enters, it triggers, returning Walk the Aeons from your graveyard to your hand.
Repeat.

Result

Infinite turns; Lock

Cheaper, tighter, alternate lines

Time Warp and Temporal Mastery both substitute for Walk the Aeons as the extra-turn spell — Temporal Mastery has miracle upside but the copy bypasses that. Taking infinite turns without a win condition just locks the table; add Thassa's Oracle or a large combat threat to actually close, since the loop itself deals no damage.

Echocasting Symposium + Eternal Witness + Walk the Aeons

How it works

Cheaper, tighter, alternate lines

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