Orcus is pricey, but in the right deck, he can do a lot of work, particularly if you opt to fish him out of the graveyard
Chart shows the price of Prompto Argentum [Borderless Foil] #387 at the end of each month going back as long as we have tracked the item.
If you run this out with Prossh, Skyraider of Kher, 49 of the nonland cards pretty handily go with the plan, while Shattergang Brothers only want about 29 of them
Thinking about your side of the field, cards like End the Festivities, Forked Bolt, and Play with Fire are burn spells that are very good to deal with convoke decks or small creature/weenie decks, while not being useless against midrange or control
If one of the two target creatures becomes an illegal target, Run Away Together can still determine its controller only to check whether the other creature is a legal target
All things considered, its a free sac outlet and in a good color combination for this archetype