When is an item removed from its Item Pool?

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I want to do a Jera + Blank Card break.
I've found the Blank Card in a Basement shop but I hadn't enough coins to buy it, so I had to leave it there.
Anyway I've started generating several chests with D20 + Sharp Plug and I've already exhausted the Golden Chest item pool, I'm finally getting Tresure Room items.
So I'm wondering: can I still find the Blank Card if I've already seen it (and not bought) in a shop?
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What is an item pool?
An item pool is a collection of test items for a given domain usually stored in com puter memory along with a list of codes for their attributes.What is Item pool in psychological testing?
Item Pool Visualization illustrates a comparison of different structural equation models that are estimated with the same data. It combines the advantages of general and correlated factor models when evaluating psychological instruments.Does d6 work in Devil room?
Breakfast. Devil Room, then rerolls, the prices of the items switch over to soul hearts. Using the D6 on an active item yields different rerolls depending on whether you picked up the active item first. Diplopia will reroll all the items into different items.What does weight mean in Isaac?
Item WeightThe weight represents how likely it is for the game to spawn the item. Nearly every item in the game has a weight of 1. For example, if there are 200 items in a given item pool, and each item has a weight of 1, that means there is a 1 in 200 (0.5%) chance to get any particular item from that pool.WHAT IF EVERY FLOOR HAD ITS OWN ITEM POOL? (ft. @bd1p)
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