Seasons Past, Time Walk, and Mastermind's Acquisition

Prerequisites

• Seasons Past in the library
• Time Walk in hand
• Mastermind's Acquisition in hand
• each turn available

Steps

1. Cast Time Walk by paying its mana cost, causing you to take an extra turn after this one Cast Mastermind's Acquisition by paying its mana cost, searching your library for Seasons Past and putting into your hand
2. Cast Seasons Past by paying , returning Mastermind's Acquisition and Time Walk from your graveyard to your hand and putting Seasons Past onto the bottom of your library
3. Repeat

Results

• Infinite turns
• Lock