Doom's Time Platform, Rift Elemental, and Capture of Jingzhou

Prerequisites

• Doom's Time Platform on the battlefield
• Rift Elemental in hand
• Capture of Jingzhou in hand
• the first turn with each extra turn available

Steps

1. Cast Capture of Jingzhou by paying its mana cost, causing you to take an extra turn after this one
2. Declare any creature as an attacker
3. When you do, Doom's Time Platform triggers, exiling Capture of Jingzhou from your graveyard with two time counters on it
4. Move to your next turn
5. At the beginning of your upkeep, Capture of Jingzhou's suspend ability triggers, removing a time counter from it
6. Activate Rift Elemental by paying and removing a time counter from Capture of Jingzhou
7. Capture of Jingzhou's suspend ability triggers, causing you to cast it without paying its mana cost
8. Resolve Capture of Jingzhou, causing you to take an extra turn after this one
9. Repeat from step 2

Results

• Infinite turns
• Lock