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Yes, countering the right sorcery will be useful, but this thing could be dead in your hand

Commander 2019: Primal Genesis lets you overrun the table with an army of massive dragons and rhinos JOIN THE FRAY

#2 I don't understand the need for making Prof

There IS in fact enough contrast in foil cards to show up with 2D x-ray images: Hitmonchan (japanese, looks different): This also incidentally provides a pretty easy tell for fake cards --- however they show up, it looks different

The more spells in a players graveyard, the more options/effects activate for players

You can see here how do we test them to assure their authenticity