Was struggling with Yellow Deck (certainly compared to Blue, which seemed much easier than Red) until just now, when I've got a superb run of jokers. Here's what I've got (now starting Endless Mode), left to right:
To The Moon - extra $1 (per $5 held) of interest at the end of each round. Got this early on and it helped me rack up lots of cash
Abstract Joker - +3 mult for each joker held (currently +24)
Space Joker
so powerful!
Oops! All 6s - doubles listed probabilities. Meaning Space Joker upgrades my hand 50% of the time. And I didn't realise those upgrades remained for the run!
Greedy Joker - +4 mult for each scored Diamond card (I've used lots of Tarot cards to convert other suits into Diamonds)
Smiley Face (negative) - played face cards give +4
Blueprint (negative) - copies ability of Joker to the right
Driver's Licence (negative) - x3 mult if you have at least 16 enhanced cards in deck (currently 29)
If I can somehow find the Joker that adds to your mult for each card added to your deck, I'll be laughing in Endless Mode!