@DrMrLordX
If supply is fixed, then any extra customer must result in someone else not having a card, because it is physically not possible for people to own more cards than there are. If 10 cards get sold and for a certain price there are 10 buyers, but another buyer comes who is willing to pay that price, then 1 of those 11 people have to go without a card, for example by raising prices sufficiently to price out one of these people.
This is fundamentally no different from the situation where there are hundreds of thousands of cards and buyers. It is a fallacy to think that the quantity matters.
Of course, buyers being priced out is merely one of the two ways in which demand and supply can be made to match up. The other is to increase production. When the factory is underused and can just increase production to make up for the extra buyer(s) it is not necessarily true that anyone needs to get priced out of owning a card.
Of course, there are some complicating factors like stock levels (which is used as a buffer, so extra demand will initially eat into stock), a delay between stock reducing and factories producing more, a delay between production and delivery, etc. Yet all of these do not change the fundamentals. If stock gets low, sellers will raise prices, while they lower prices if stock gets high. So extra demand will result in higher prices, which prices out potential buyers, unless that stock is replenished in time.
If you want to know whether Larry prevented one or more gamers from getting a card, you need to know whether Larry's purchase made the factory produce more cards at a time when they were underused, which is something that we can only guess it.