Doom's Time Platform + Rift Elemental + Walk the Aeons

Prerequisites

• You control a creature that can attack and that cannot be blocked or killed by an opponent.

Steps

1. 1Cast Walk the Aeons by paying its mana cost, causing you to take an extra turn after this one.
2. 2Declare 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.
3. 3Move to your next turn. At the beginning of your upkeep, Walk the Aeons's suspend ability triggers, removing a time counter from it.
4. 4Activate Rift Elemental by paying and removing a time counter from Walk the Aeons.
5. 5Walk the Aeons's suspend ability triggers, causing you to cast it without paying its mana cost.
6. 6Resolve Walk the Aeons, causing you to take an extra turn after this one.
7. 7Repeat from step 2.

Effects

• Infinite turns
• Lock