The arithmetic, plainly
You start with a standard 52-card deck. Say four of those cards are the ones your build actually wants to see — a particular rank, or a suit you’ve converted everything to.
- At 52 cards: any single card you draw has a 4 in 52 chance of being one of them — about 7.7%.
- At 40 cards: the same four cards are now 4 in 40 — 10%.
- At 32 cards: 4 in 32 — 12.5%.
You added nothing. You removed cards, and the card you wanted became more likely. That is the entire argument for thinning.
It pays off twice. It makes every hand you have levelled findable. It also makes every joker that triggers on a specific card fire more often.
Removal vs conversion
Both make the deck better, and they are not interchangeable.
Remove a card when it is dead weight — it contributes nothing to any hand you plan to play and cannot plausibly become useful. Removal is permanent and always improves draw quality.
Convert a card (suit, rank, or enhancement) when it is nearly useful. Early on, conversion usually beats deletion. It turns a bad card into a good one instead of just removing it, and it keeps deck size intact for effects that care about deck size.
A useful default: convert first, remove second, and remove aggressively once you’ve committed to a hand type. Before committing, your deck still needs options; after committing, it needs purity.
What to cut, in priority order
- Cards that fit nothing. Ranks and suits your committed hand cannot use.
- Cards that actively harm you. Anything that interferes with a joker’s condition, or that a boss blind can punish.
- Duplicate low-value cards, once you have more good cards than you can play in one hand.
The second category is where most of the value hides and where players cut too little. A card that blocks a condition is worse than a card that does nothing.
When not to thin
Thinning is not universally correct. Skip or slow it when:
- An effect scales with deck size or with specific cards. If a joker’s payoff depends on what’s in the deck rather than what you draw, removing cards can reduce it. Read the text.
- You haven’t committed to a hand. Cutting toward a hand you later abandon is the same mistake as levelling the wrong hand.
- You are being offered better things. Thinning competes for money and consumable slots. If the shop has a multiplier your build archetype desperately needs, that wins.
Thinning is a scoring upgrade disguised as housekeeping
The reason this belongs alongside jokers and hand levels rather than filed under “tips” is that it multiplies everything else:
- It raises how often your committed hand appears — which is what makes hand levels pay off.
- It raises how often condition-based jokers fire — which is what makes retrigger and ×Mult builds reach their ceiling.
- It reduces variance — which is what lets you take aggressive lines late in a run.
A run that thins consistently and buys one fewer joker will, more often than not, outscore the run that bought the joker.
Next: A framework for boss blinds.