Extravagant Replication + Eternal Witness + Time Stretch

3-card combo · GU

Verdict

Yes — this 3-card loop chains Time Stretch indefinitely through Extravagant Replication and Eternal Witness tokens.

Cards required: 3
Cheapest stack total: $5.72
Color identity: GU
Popularity: 18 decks
Format: Commander

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Extravagant Replication triggers at the start of each upkeep, cloning Eternal Witness; the entering token retrieves Time Stretch from the graveyard so it can be cast again next turn. The second extra turn Extravagant Replication created closes the loop cleanly. The shell is Simic enchantress or spellslinger — something that can reliably cast a 10-mana sorcery and keep all three pieces in play long enough to untap.

Recipe

How it works

Prerequisites

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Steps

Cast Time Stretch by paying its mana cost, causing you to take two extra turns after this one.
Move to your next turn.
At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Eternal Witness.
When the Eternal Witness token enters the battlefield, it triggers, returning Time Stretch from your graveyard to your hand.
Repeat during your second turn.

Result

Infinite turns; Lock

Variations

Cheaper, tighter, alternate lines

Seasons Past can substitute for Eternal Witness if recursion redundancy is needed, though it doesn't ride Extravagant Replication directly. Time Warp and Temporal Manipulation are cheaper turn-extra spells that slot in for Time Stretch if the 10-mana cost is a liability — the loop works with any extra-turn spell that hits the graveyard. Add Wilderness Reclamation or Kinnan, Bonder Prodigy to make casting Time Stretch in the first place less punishing.