Nothing too special. Lightsworn relies on high-rolling pretty heavily, but the simple addition of just one Phantom of Chaos and one Monster Reincarnation is absolutely insane for the deck. It allows you to use basically any effect you want, including Judgement Dragon, as long as you have that card in the GY. This is comes up rather often, especially in the mid / late-game, but if you happen to ditch a JD early on and Normal Summon the Phantom, it can be game-ending. It allows for a second use of basically anything in the deck, from Lumina to gain a board presence back, Ehren to out a sneaky facedown, Chaos Sorcerer to out an annoying card, a Tragoedia for funny plays, or a Card Trooper for quick mills. Otherwise pretty standard.