Doom's Time Platform + Clockspinning + Capture of Jingzhou

Doom's Time Platform

Clockspinning

Capture of Jingzhou

How it works

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. When you do, Doom's Time Platform triggers, exiling Capture of Jingzhou from your graveyard with two time counters on it.
3. Move to your next turn. At the beginning of your upkeep, Capture of Jingzhou's suspend ability triggers, removing a time counter from it.
4. Cast Clockspinning with buyback by paying 3, removing a time counter from Capture of Jingzhou and returning Clockspinning to your hand.
5. Capture of Jingzhou's suspend ability triggers, causing you to cast it without paying its mana cost.
6. Resolve Capture of Jingzhou, causing you to take an extra turn after this one.
7. Repeat from step 2 each turn.