The half decks are compatible with the original Jumpstart decks as well as the set specific Jumpstart boosters
Thats a card called Library of Alexandria, printed in 1994, Teddy Carfolitea South Carolina school teacher and avid Magic: The Gathering player told me

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When Stromkirk Mystic deals combat damage to the opponent, its controller exiles the top card of their library
This is why, years later, I made this card in Innistrad : So, if anyone ever asks you who in the Multiverse cares the most about shovels, now you know
They appear at all rarities