Parallax Wave + Leonin Relic-Warder + Reveillark + Altar of Dementia

Parallax Wave

Leonin Relic-Warder

Reveillark

Altar of Dementia

How it works

1. Activate Parallax Wave by removing a fade counter from it, exiling Reveillark.
2. When Reveillark leaves the battlefield, it triggers, returning Leonin Relic-Warder from your graveyard to the battlefield.
3. When Leonin Relic-Warder enters the battlefield, its first ability triggers, exiling Parallax Wave.
4. When Parallax Wave leaves the battlefield, it triggers.
5. Holding priority, activate Altar of Dementia by sacrificing Leonin Relic-Warder.
6. When Leonin Relic-Warder leaves the battlefield, its second ability triggers, returning Parallax Wave from exile to the battlefield.
7. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Leonin Relic-Warder's power.
8. Resolve the Parallax Wave trigger from step 4, returning Reveillark from exile to the battlefield.
9. Repeat.

This ingenious loop relies on a clever interplay of exile-and-return triggers to constantly cycle your creatures through the graveyard. By using Parallax Wave to temporarily stash Reveillark, you trigger the latter's death ability to return Leonin Relic-Warder, which in turn exiles Parallax Wave to start the loop over. Meanwhile, Altar of Dementia capitalizes on this infinite cycle by sacrificing Leonin Relic-Warder whenever needed, milling out your opponents while fueling the perpetual motion machine.