Above, you can see the Shining Fates pack art revealed featuring Shiny Gigantamax Charizard, Shiny Corviknight, Shiny Dragapult, and Shiny Toxitricity
30 years before the proxy debacle, the original box of squared Collectors Edition cards was printed, to look at and not play with, and with that horrifyingly terrible gold-bordered back
Even a single misplaced word can signal a fake
You'll want to run tokens of both colors to make that work, just like conspire enabler in Gruul Wort, the Raidmother from Shadowmoor Block
To summarize, to check the rarity of a card, simply look at its expansion symbol
Odds are you are going to get something more damaging from the randoms even with less information