Zethi, Arcane Blademaster + Walk the Aeons + Cosmic Intervention

Prerequisites

• Zethi does not have summoning sickness.
• You control at least three Islands.

Steps

1. 1Declare Zethi as an attacker.
2. 2Zethi's last ability triggers, causing you to pay to cast a copy of Cosmic Intervention, creating a replacement effect that is active this turn.
3. 3Move to your postcombat phase.
4. 4Cast Walk the Aeons with buyback by paying and sacrificing three Islands, putting the Islands in exile instead of the graveyard and creating a delayed triggered ability due to Cosmic Intervention's replacement effect.
5. 5Resolve Walk the Aeons, causing you to take an extra turn after this one and returning Walk the Aeons to your hand.
6. 6At the beginning of your end step, Cosmic Intervention's delayed triggered ability triggers, returning the exiled Islands from exile to the battlefield.
7. 7Repeat each turn.

Effects

• Infinite turns
• Lock