I really like using Magic: the Gathering for ML tasks, because there's a huge dataset (roughly 25,000 unique cards) readily available
The other Invitationals were run using Magic: The Gathering Online
The most reliable approach is to look up the card in a dedicated database like Scryfall or MTG Wiki, which documents rarity for every card in every set
Take Inventory | Illustration by Greg Staples You don't need to bring all the bells and whistles to a prerelease, but there are a few essentials that I recommend to anyone whos going beyond the kitchen table to play some Magic: A way to track life totals
Two of the most notable are the Pikachu and Mewtwo cards that players get by subscribing to the Premium Pass, with the card of the franchise's mascot no longer being available
There are some cards that force players to untap one at a time, however, like Winter Orb, Hokori, Dust Drinker, and Winter Moon