You have a creature card in hand or in your graveyard that has a cycling ability and can be cast using ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) .
You are able to cast the creature card.
Steps
Cast the creature card with cycling either from your hand or from your graveyard by paying its mana cost, causing it to enter the battlefield as a copy of Composite Golem.
If you cast the creature from your graveyard, it is not exiled by Abandoned Sarcophagus due to Infinite Reflection removing the creature's cycling ability.
Repeat.
If the creature has mana value 4 or less, this combo nets infinite mana.