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Here comes the b0/0m In my adventures(or misadventures if you think about it) I've found that there is nothing quite like beating your opponents with bad cards

Rite of Aramesir A lot of spell power for a low cost This spell cards strength comes from its ability to combo into a multi-negate board that you can use to slow your opponent down and allow your deck more time to build itself up to maximum strength

That surprising number can become quite threatening if you deploy a few token doublers like Parallel Lives and Doubling Season

Card Size is Different Paper Quality difference and Paper Thickness, but this depends on the set too I think, because they may change the paper stock that they use depending on cost of materials you can also ask a Pokemon Professor, they may have insight into fake cards entering the market and be able to give you pointers in spotting fakes