What does the Breach the Bastion calculator measure?

It estimates the probability of drawing at least one copy of a chosen card from your deck without replacement.

Does the calculator use hidden game values?

No. It calculates standard draw probability using only the deck and draw values you enter.

Deck laboratory

Card Draw Calculator

Test how deck size and duplicate copies change the odds of seeing your key card.

Cards in deck 10Copies of key card 1Opening hand size 5Extra cards drawn 0

Chance by draw 5

50.0%

Chance to see at least one of 1 copy among 5 drawn cards.

How to use this tool

Enter your current deck size, the number of copies of the card you care about, your opening hand and any additional draws. The result uses the exact hypergeometric probability for draws without replacement.

This is a planning model, not an official game feature. It does not assume any unverified card or character stats.

Frequently asked questions

Can this compare two deck choices?

Yes. Note the first result, then change deck size or copies. A smaller focused deck usually raises the chance of finding a particular card.

Is the result guaranteed?

No. Probability describes many possible draws; any individual run can still be lucky or unlucky.