Cast Hollow One either from your hand or from your graveyard by paying at most 1.
Activate Krark-Clan Ironworks by sacrificing Hollow One, adding CC.
If you cast Hollow One from your graveyard, Hollow One is not exiled by Abandoned Sarcophagus due to Overwhelming Splendor removing Hollow One's cycling ability.
Repeat.
This cunning loop turns the rules of the graveyard inside out by leveraging Overwhelming Splendor to strip Hollow One of its printed cycling ability. Because Overwhelming Splendor turns off its rules text, casting Hollow One from your graveyard avoids the exile replacement effect of Abandoned Sarcophagus, allowing the creature to return to the hand or graveyard cleanly instead. Once it hits the graveyard, you simply sacrifice it to Krark-Clan Ironworks for a pair of colorless mana, generating a surplus that fuels the loop indefinitely.