15 cards where the card types include “basic” and the set is “4bb”

Forest (Fourth Edition Foreign Black Border #376)
Forest (Fourth Edition Foreign Black Border #377)
Forest (Fourth Edition Foreign Black Border #378)
Island (Fourth Edition Foreign Black Border #367)
Island (Fourth Edition Foreign Black Border #368)
Island (Fourth Edition Foreign Black Border #369)
Mountain (Fourth Edition Foreign Black Border #373)
Mountain (Fourth Edition Foreign Black Border #374)
Mountain (Fourth Edition Foreign Black Border #375)
Plains (Fourth Edition Foreign Black Border #364)
Plains (Fourth Edition Foreign Black Border #365)
Plains (Fourth Edition Foreign Black Border #366)
Swamp (Fourth Edition Foreign Black Border #370)
Swamp (Fourth Edition Foreign Black Border #371)
Swamp (Fourth Edition Foreign Black Border #372)

The message was clear to Sorin—time to search for something else.