I see. Well then I would consider using 2 peeking goblin if you have any from beating yami bukura in the recent event that just passed. If you collected peeking goblins it'll allow you to see 3 face up cards in your opponents deck and move 1 to the bottom and 2 at the top in the order you choose. So if you find your parasite in the deck it should allow you to move it on top of the deck. If your running 3 of these in your deck it'll be destructive. Also on top of that it should favor the odds of the battle at the same time knowing what the opponent has and is gonna draw each turn
Running 3 of those cards would not be a good idea. Jade Whistle already brings them directly to the top so why bother with other cards that do so? Plus if you don't find the parasite in those 3 cards which is very possible/likely you've essentially wasted a card in your hand and deck. Decks with 20 cards/all competitive decks, can't afford to add 3 "ok" cards.
Jade the whistle doesn't always bring your parasite on top due to the over use of 4 star lady bug. Higher end decks run multiple 4 star lady bugs due to its effect. So I'm my personal opinion I think peeking goblin would be more of a positive attribute to add in the deck. Even if you don't get the parasite when you activate it. You get to Reveal opp deck and strategize from their.
Knowing your opponents next 3 cards isn't a huge advantage, if so everyone would use Mind Scan. And yes I'll agree on ladybug, but not a lot of decks run with ladybug let alone more than one. Peek Goblin would take too long to ensure parasite gets out quickly and if they have 3 monsters already you're screwed
And yet here we are. On a board message with a list of decks in this thread alone where multiple Lady Bugs are suggested. Thus killing your assumption.