The Lost Caverns of Ixalan Promos

Hit the Mother Lode

Discover 10. If the discovered card's mana value is less than 10, create a number of tapped Treasure tokens equal to the difference. (To discover 10, exile cards from the top of your library until you exile a nonland card with mana value 10 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

The Lost Caverns of Ixalan

Discover 10. If the discovered card's mana value is less than 10, create a number of tapped Treasure tokens equal to the difference.