63.5x88 card sleeves TTCGM 63,5x88 mm 50pcs Thick Matte Board Games & while others have a solid colour Standard Card Game Card Sleeves

This allows the inclusion of what would otherwise be incompatible typal cards into your sliver deck

Its best to either tell the host via chat to adjust the rule set, look for another lobby, or host one with correct rulings yourself

I see this creature largely being in the 99 of things rather than at the head, but being an uncommon legend maybe someone in PDH will pick it up

For checking a single card, you go to gatherer.wizards.com (the official MTG card database) and type in the name of your card

Most likely, they were printed in USA (both have the text "Pokmon USA, INC)

Each instance of Cascade happens individually, and they must be approached in that way