Doom's Time Platform + Clockspinning + Temporal Manipulation

Doom's Time Platform

Clockspinning

Temporal Manipulation

How it works

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