Doom's Time Platform + Shivan Sand-Mage + Walk the Aeons + Y'shtola Rhul

Doom's Time Platform

Shivan Sand-Mage

Walk the Aeons

Y'shtola Rhul

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. Blink Shivan Sand-Mage using Y'shtola Rhul.
3. When Shivan Sand-Mage enters, it triggers, removing two time counters from Walk the Aeons.
4. Walk the Aeons's suspend ability triggers, causing you to cast it without paying its mana cost.
5. Resolve Walk the Aeons, causing you to take an extra turn after this one.
6. Repeat each turn.