Parallax Wave + Leonin Relic-Warder + Reveillark + Carrion Feeder

Parallax Wave

Leonin Relic-Warder

Reveillark

Carrion Feeder

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 Carrion Feeder 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 Carrion Feeder ability, putting a +1/+1 counter on it.
8. Resolve the Parallax Wave trigger from step 4, returning Reveillark from exile to the battlefield.
9. Repeat.

This intricate loop spins into motion by leveraging Parallax Wave's fading counters to exile Reveillark, whose subsequent leave-the-battlefield trigger pulls Leonin Relic-Warder out of your graveyard. As Leonin Relic-Warder enters, it swallows up Parallax Wave, and before that enchantment's return trigger can resolve, Carrion Feeder steps in to sacrifice the Cat Cleric. This sacrifice feeds Carrion Feeder a +1/+1 counter while triggering Leonin Relic-Warder to return Parallax Wave to the battlefield, allowing the Wave's delayed return trigger to bring Reveillark right back so the cycle can begin anew.