You can also do it after declaring attacks if you want to just throw your smaller creatures to a certain doom when you dont have any good attacks
It's so much more than an overpriced tutor, because a turn-two Starfield ShepherdStarfield Shepherd can grant you either the land drop you need or a nice one-drop that can impact the board right away, like Esper SentinelEsper Sentinel or MockingbirdMockingbird
This allowed players to draft Rush of Knowledge quite highly, and splash it into many decks that otherwise wouldn't have had blue
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Elvenking's Halls Land This land enters tapped
It gives a tapped out player the ability to win counter wars, to redirect an ill-timed card-drawing spell, and generally plays havoc with the targets on the board