Right now, however, it would depend on what exact Charizard EX card you are talking about, because there are several. Some are worth hundreds of dollars, but others on the other hand are only worth a couple of dollars.
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As with all Pokemon cards condition does matter but in general the value of an original charizard card holographic in good condition would be over £25 ($50). The real money comes from the 1st edition charizards which on a good day can make it over the £100 mark to the right person!