🂠 Abandoned Deck works best with 8 Ball as the smaller deck size allows for 8s to be played easier.

🂠 Ghost Deck and Zodiac Deck can potentially benefit from 8 Ball thanks to Spectral and Tarot Cards that allows more 8s to be created.

🂠 Erratic Deck can benefit from 8 Ball if its randomized to have lots of 8s.

Abandoned Deck

Ghost Deck

Zodiac Deck

Erratic Deck

♥️ Pair or Three of a Kind of 8s is good to start.

♥️ Five of a Kind or Flush Five works well once you have a lot of 8s.

🃏 DNA: Can be used to generate more 8s every blind.

🃏 Oops! All 6s: Can be used to increase the chance of a Tarot card spawning.

🃏 Blueprint and Brainstorm: Can be used to copy 8 Ball to spawn more Tarot Cards.

DNA

Oops! All 6s

Blueprint

Brainstorm

💰 The Head - All Diamond and Heart cards are debuffed.

💰 The Window - All Diamond and Heart cards are debuffed.

💰 The Club - All Club and Spade cards are debuffed.

💰 The Goad - All Club and Spade cards are debuffed.

🍔 Tarot cards: The Fool is extremely strong with Perkeo as it will allow you to duplicate cards you previously used from packs to put into your consumable slot. This makes it much easier to find the consumable cards youre looking for. The Hanged Man is one of the strongest interactions with Perkeo as you can use it to keep removing cards from your deck. Death can allow you to turn your entire deck into particular cards you want especially if theyre enhanced. The Empress and The Emperor can allow you to dig for more useful planet and tarot cards respectively. Judgement and The Wheel of Fortune can let you create more jokers if you need them or enhance existing jokers.

🍔 Spectral cards: Cryptid and Immolate are arguably the best cards to use with Perkeo. Immolate allows you to get an insane amount of money while thinning your deck out significantly and Cryptid being the most useful by letting you duplicate existing buffed up cards in your deck. Aura and Ectoplasm are useful to have so you can enhance your deck or enhance your jokers. Though you should only really try to use ectoplasm a few times at most since the compounding - hand size will eventually make it extremely hard to build a decent hand. Deja Vu Talisman Trance and Medium can allow you to cover your entire deck in seals if you need it. However the best strategy is to use them a few times and then just duplicate the cards you put them on. Red seals are the most useful for going into the late game especially for endless mode.

🍔 Planet cards: No particular planet cards synergize with Perkeo. If your deck focuses on a particular hand you can use Perkeo to endlessly duplicate the relevant Planet card to enhance the hand each round or to power the hand up with the Observatory voucher.

🎟️ The Observatory voucher is arguably the strongest synergy one can get with Perkeo. It makes planet cards in your consumable slot give x1.5 mult for their respective hands when that hand is played so naturally you want to build your deck to play a particular hand. The most consistent for Endless mode are likely either High Card Five of a Kind or Flush Fives though it can be built to work with any hand. If you can get just one of the planet cards that relates to the hand you want to play most it can cause some insane scaling. This is doubly true for for any effects like Blueprint or Brainstorm where having those can get 1 2 or even 3 cards from Perkeo for every shop you get.

🎟️ Tarot/Planet Merchant and Tycoon can give you better access to Planet and Tarot Cards to duplicate. The Zodiac deck works well with Perkeo as it starts with both the Tarot Merchant and Planet Merchant vouchers.

📚 This cards name and design are a reference to how in a normal playing cards deck Clubs and Spades are the same color just like Diamonds and Hearts. As such if the actual symbol of the suit was smeared and illegible it would be difficult to tell them apart.