20 cards where the card types include “basic” and the set is “m21”

Forest (Core Set 2021 #272)
Forest (Core Set 2021 #273)
Forest (Core Set 2021 #274)
Forest (Core Set 2021 #313)
Island (Core Set 2021 #263)
Island (Core Set 2021 #264)
Island (Core Set 2021 #265)
Island (Core Set 2021 #310)
Mountain (Core Set 2021 #269)
Mountain (Core Set 2021 #270)
Mountain (Core Set 2021 #271)
Mountain (Core Set 2021 #312)
Plains (Core Set 2021 #260)
Plains (Core Set 2021 #261)
Plains (Core Set 2021 #262)
Plains (Core Set 2021 #309)
Swamp (Core Set 2021 #266)
Swamp (Core Set 2021 #267)
Swamp (Core Set 2021 #268)
Swamp (Core Set 2021 #311)

Though this query has ended, its relics still slumber in New Argive.