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In the example you have tried you have a missing single-quote'. either fix the concatenation (and missing quote), or change the single-quote to double-quotes and change the brackets to curly brackets {}
either way should work:

    header('Content-Disposition: attachment; filename=' . $tcgname[$i] . '.png'); //the brackets are not required here

or

    header("Content-Disposition: attachment; filename={$tcgname[$i]}.png");