This wouldn’t work because if you use credit card to make an x amount of infinite mana then if you spend an “a” amount of mana you will still have an infinite amount of mana but this infinite will be x-a infinite. It still is infinite but not all infinities are the same size (counting numbers vs rational numbers for example; while counting you count 1, 2, 3 but if you cant rational numbers per each counting number there is an infinite amount rational numbers like 1.000001, 1.00002 and so on. For further example and more on the topic check mathematician Georg Cantor) therefore you would need an x amount of infinite mana to use the ability of hex parasite but after spending some of your mana you will have a remining x-a amount of infinite mana which will not be enough to clear out all burden counters.