Abandoned Sarcophagus + Phyrexian Altar + Overwhelming Splendor + Hollow One

Abandoned Sarcophagus

Phyrexian Altar

Overwhelming Splendor

Hollow One

How it works

1. Cast Hollow One from your graveyard by paying at most 1.
2. Activate Phyrexian Altar by sacrificing Hollow One, adding one mana of any color.
3. Hollow One is not exiled by Abandoned Sarcophagus due to Overwhelming Splendor removing Hollow One's cycling ability.
4. Repeat.
5. If you have discarded and/or cycled three or more cards, this combo nets infinite colored mana.

This clever engine exploits a fascinating rules interaction centered around Abandoned Sarcophagus, which normally exiles any card with cycling that goes to your graveyard without being cycled. By casting Overwhelming Splendor on yourself, its static ability strips Hollow One of its cycling ability entirely before it hits the graveyard, bypassing the replacement effect of Abandoned Sarcophagus and allowing you to repeatedly cast the creature from your graveyard for a heavily discounted rate. Once it enters the battlefield, you simply feed it to Phyrexian Altar to generate colored mana, creating an infinite loop of sacrifices, deaths, and mana.