Eragon, Farmhand

Bountiful Harvest—{t}: Put a Rune counter on target land you control. That land gains "{t}: Add {g} for each Rune counter on it."

Miraculous Discovery—{t}, Sacrifice Eragon, Farmhand: Remove all Rune counters from lands you control. Search your library for a creature card with mana value less than the number of Rune counters removed this way.
You may cast that card without paying its
mana cost. Then shuffle your library.