Abandoned Sarcophagus + Phyrexian Altar + Dress Down + Hollow One

Abandoned Sarcophagus

Phyrexian Altar

Dress Down

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 Dress Down 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 loop turns Hollow One’s self-contained cycling ability into a perpetual mana engine, all by disabling a single line of rules text. Ordinarily, Abandoned Sarcophagus would exile Hollow One the moment it hits the graveyard from anywhere without being cycled, but Dress Down’s static enchantment ability strips away Hollow One's cycling ability entirely, allowing it to slip safely back into your graveyard instead. From there, you simply cast Hollow One for cheap—its cost reduced by your previous discards—and feed it to Phyrexian Altar to generate colored mana, repeating the cycle as many times as you desire.