Warning!
Some RPG systems are protected by copyright.
Even if some spell/item data is freely available, it does not mean you may redistribute cards containing such data.
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Printing generated cards
The generated cards open in a new tab or window. If you don't see any new tab or window, check your popup and script blockers. If that does not help, try disabling all addons.
Make sure your printer uses the correct paper size (same as in the editor).
Enable double sided printing (flip on long edge).
Do not scale the document to fit the page. Print at original size.
Some printers are not very precise (pages print slightly shifted or rotated) and the cards will not line up with the card backs.
If this is the case, there's not much you can do.
Try making the page background the same color as the cards, so that you won't get any white edges on the card.
If that does not help, try a different printer or print single-sided.