The main idea of this combo is cycling the entire deck, with at last 6 Order Resources, with Reloras and a couple of creatures in play, and the three Decay cards in hand. Since you cycle your entire deck, you could save Reloras and your finishers for the last turn, if you do so, you will need more resources. If you manage to do this, you win.
Play your creatures, at least three relentless or piercing ones and a Reloras. The Relentless/Piercing must be in a different rows, and each one in contact with Reloras. After that, you must have 6 Order resources free. Sacrifice one of the two Sleep Moratorium for a Decay Resource, cast Eclipse (now you have 5 Decay), cast the other Sleep Moratorium. At this point, the only card in your graveyard is the first Moratorium, so the Sift only has one option. Cast again this Sleep Moratorium targeting the second one, and repeat that until your Reloras build up your creatures enought for taking down an idol with a single shot (80+ in the case of Arbs, it would be a lot less with some Relentless creature).
Each card in this deck fullfils a role: Combo piece (Sleep Moratorium, Reloras, Eclipse), Defense (structures), Finishers (Relentles and piercing creatures) and Drawing (All other scrolls). Drawing is very important, since we need to reset the graveyard by cycling the entire deck. Imperial Resources is here a very important piece, since it gives you some Idol heal, two steps ahead cycling your deck and a little, but crucial, late ramp. Since we lack of true working creatures, copies of Cay and Reversal are dropped. The first one rarely triggers, since we don't actually want to "enter in combat", and the second one is kind of useless.