"Herald of the Arc Light" can be send in order to Ritual Summon "Nekroz of Unicore", which will trigger the second effect of "Arc Light" and search for more resources. The effect of "Outer Entity Nyarla" can also then be used to attach "Arc Light" to it as an Xyz Material, and then detach it later to make use of the search effect again. This can be repeated to thin the Deck and allow for more Ritual Summons. Note that the search effect will still be applied even if "Nyarla" leaves the field while "Arc Light" is attached to it.
If 2 or more "Nekroz" Ritual Monsters are Ritual Summoned with this card's effect, the following combinations are possible based on the Level of the Tribute used. (There are technically more possibilities, but would require using cards to exceed Level 12):
"Shooting Quasar Dragon" can be send from your Extra Deck to your Graveyard with the effect of this card in order to Ritual Summon 2 copies of "Nekroz of Brionac", and then overlay them to Xyz Summon "Inzektor Exa-Beetle". Use the effect of "Exa-Beetle" to equip "Shooting Quasar Dragon" from the Graveyard to itself. If "Shooting Quasar Dragon" leaves the field (for example, by the effect of "Exa-Beetle" itself), a "Shooting Star Dragon" can be Special Summoned from your Extra Deck.