Find the Path

Choose a creature you control at the start of combat. When that creature attacks, search
your library for a basic land and put it onto
the battlefield tapped.

Mythic {4}{g}{g} (You may cast this for its Mythic cost. If you do, the effect becomes “Choose a creature you control at the start of combat. When that creature deals combat damage, search your library for that many basic lands and put them onto the battlefield tapped.”)