Typically you'll dredge over many cards at once, hitting some combination of Narcomoebas and Prized Amalgams, then your Illusions will trigger and get put onto the battlefield, triggering your amalgams in the graveyard to come back later
If this card battles a monster, neither can be destroyed by that battle
Finally free from Valiant Smashers exclusivity, Bone Party helps you get some Special Summons directly from the deck
Even though you get more cards in this one the value is very low, though the excellent artwork and well-chosen story moments help make up for it
Its a neat take on a bounce spell that punishes aura/equipment decks, which are already soft to interaction
Its a lot easier to get the benefits of Sythiss abilities when even your creatures are triggering it