Repository Skaab, Time Walk, and Muldrotha, the Gravetide

Prerequisites

• Repository Skaab in hand or in the graveyard
• Time Walk in hand
• Muldrotha, the Gravetide on the battlefield
• each turn available

Steps

1. Cast Time Walk by paying its mana cost, causing you to take an extra turn after this one
2. Cast Repository Skaab either from your hand or from your graveyard by paying
3. When Repository Skaab enters, its exploit ability triggers, causing you to sacrifice it
4. Repository Skaab's second ability triggers, returning Time Walk from your graveyard to your hand
5. Repeat each turn

Results

• Infinite turns
• Lock