Parallax Wave + Leonin Relic-Warder + Reveillark + Phyrexian Altar

Parallax Wave

Leonin Relic-Warder

Reveillark

Phyrexian Altar

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 Phyrexian Altar by sacrificing Leonin Relic-Warder, adding one mana of any color.
6. When Leonin Relic-Warder leaves the battlefield, its second ability triggers, returning Parallax Wave from exile to the battlefield.
7. Resolve the Parallax Wave trigger from step 4, returning Reveillark from exile to the battlefield.
8. Repeat.

This loop spins up into infinity by recursively trading exile zones and graveyards to constantly reset your board state. You start by using Parallax Wave to banish Reveillark, which triggers Reveillark's leaves-the-battlefield ability to fish Leonin Relic-Warder straight out of your graveyard. That brings Leonin Relic-Warder into play, whose entry trigger swallows Parallax Wave—which in turn immediately dumps Reveillark right back onto the battlefield. Meanwhile, you sacrifice Leonin Relic-Warder to Phyrexian Altar to churn out infinite colored mana while sending it back to the graveyard to be fetched all over again, fueling an endless engine of death, sacrifice, and entry triggers.