Has anyone thought about this?
Basically, how much are all the Magic cards worth?
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If you can cast a spell, you're doing well, If you can't, that's okay, too. It usually takes a few turns before you have enough mana to do anything. Meanwhile, you should figure out whether you need to discard (p.11). Then announce the end of your turn, and let your opponent have a go.
Even based on bulk value of cards, it should be worth almost a billion alone. Along with the high value cards which are printed in the hundreds of thousands range, likely more, it should easily be worth several billion on the secondary market. Although it should also be pointed out, if you hoarded every magic card, the control of the supply would likely raise their value.
Interesting question. Well, we know there's approx 350,000 ABUR duals, and a set is worth about $1,000, so that's $350,000,000 right there. There's about 15,000 of each piece of power, and a set is worth maybe 15 grand, so that's another 225,000,000. So we're at a half-billion dollars in JUST duals and power. These are obviously very rough numbers, as we all know many of these cards are lost, damaged, or destroyed, making the numbers lower, but on the other hand alpha/beta/misprint/graded cards are worth a lot more, making the numbers higher. So let's just say a half-billion.
It's probably fair to say there are more than the above 350k of most valuable cards. If we say that there are at least 500 total cards that are worth at least $10, and each of those has at least 1 million copies... that'd be 5 billion as a floor. Realistically it's probably a lot higher... a lot of cards are worth WAY more than $10, and then there are foils, foreign foils, ect that have extreme prices ($1 million will buy you about 400 russian foil futuresight tarmogoyfs).
Given all that, I think it's fair to say the order of magnitude of the market value of all MTG cards is probably between 10 and 100 billion dollars.