The Tenth Doctor + Doom's Time Platform + Walk the Aeons

The Tenth Doctor

Doom's Time Platform

Walk the Aeons

How it works

1. Declare any creature as an attacker. When you do, Doom's Time Platform triggers, exiling Walk the Aeons from your graveyard with two time counters on it.
2. Activate The Tenth Doctor by paying 7, removing the time counters from Walk the Aeons.
3. Walk the Aeons's suspend ability triggers, causing you to cast it without paying its mana cost.
4. Resolve Walk the Aeons, causing you to take an extra turn after this one.
5. Repeat each turn.

This clever loop sets up an endless chain of extra turns by weaponizing the suspend mechanic, letting you bypass the usual wait for time counters. Whenever you declare an attacker, Doom's Time Platform steps in to pluck Walk the Aeons straight out of your graveyard and prime it with two time counters. From there, you simply tap into The Tenth Doctor's hefty mana-sinking activated ability to manipulate those counters and trigger the suspend cast for free. As Walk the Aeons resolves to grant you consecutive extra turns, you can safely repeat the whole process attack after attack, locking down the game indefinitely.