Phantom Steed, Temporal Manipulation, and Possessed Skaab

Prerequisites

• Phantom Steed on the battlefield
• Temporal Manipulation in hand
• Possessed Skaab in exile
• each turn available

Steps

1. Cast Temporal Manipulation by paying its mana cost, causing you to take an extra turn after this one Declare Phantom Steed as an attacker
2. It triggers, creating a token copy of Possessed Skaab that's tapped and attacking
3. When the Possessed Skaab token enters, it triggers, returning Temporal Manipulation from your graveyard to your hand
4. Repeat each turn

Results

• Infinite turns
• Lock