This is fine for us as a vast majority of our plays involve monsters that are already of the Zombie type, however if our opponent is not running a Zombie Deck, well tough luck they will be unable to make any summons as Zombie World only makes the monsters on field or graveyard Zombies, not the hand or Extra Deck
If this card is sent to the Graveyard: You can target 1 "Frightfur" Fusion Monster in your Graveyard
And because this ability triggers upon entry, you don't have to particularly worry about keeping Trishula safe since you'll have already made good use of its effect
In the Pokemon Trading Card Game, the Paradox Pokemon were brought over as Ancient and Future cards respectively, with their own gimmicks and mechanics
Other sets, particularly Obsidian Flames, are concentrated around a small number of high-value cards, creating higher risk and greater difficulty for collectors attempting to obtain the top chase cards