Paleozoic Dinomischus doesn’t do enough by itself considering you have Grapha to pop cards and work with the Dark World strategy

Saryuja Skull Dread (2800 ATK, Link 4) can be summoned by using 2 or more monsters with different names. The effects of this card are linked to the number of material used and they range from granting linked monsters 300 ATK/DEF to special summon 1 monster from your hand.

Special Summons a monster from the opponent's Graveyard to the player's field in face-up Defense Position.

Another uncommon strategy is discarding " Ceruli, Guru of Dark World" when you have a "Dark World" monster that gains effects when discarded by an opponent's card effect (e.g. " Reign-Beaux, Overlord of Dark World", "Goldd", or "Snoww"). Since the effect of "Ceruli" summons itself on the opponent's side of the field, you are the target of its discard effect; this gives your "Dark World" monster a special effect and wastes the opponent's field space. If this card is discarded to the GY by card effect: Draw 1 card, or, if it was discarded from your hand to your GY by an opponent's card effect, draw 2 cards instead.

With No Nibiru You Can Go Crazy

If this card is discarded to the GY by card effect: You can target 1 "Dark World" monster in your GY, except "Parl, Hermit of Dark World"; Special Summon it to either field, then, if this card was discarded from your hand to your GY by an opponent's card effect, you can Special Summon, to either field, 1 of your Fiend monsters that is banished, or in your hand or GY. You can only use this effect of "Parl, Hermit of Dark World" once per turn. Declare 1 card name; if that card is in your opponent's hand, they must discard all copies of it, otherwise you discard 1 random card.