Loamkeeper

{t}: Until the beginning of your next upkeep,
whenever a player taps a land for mana, that
player adds one mana of any type that land
produced. Play this ability as a sorcery.
Whenever an opponent has added more mana
than lands they control during their turn, search
your library for up to 2 land cards, reveal them,
put 1 of them into play tapped and the other
into your hand, and shuffle Loamkeeper into
your library.