At four mana, it's likely to pay for itself between the time you cast it and when you untap your lands on the next turn
Is this a good thing for Magic
Still a great setup play, especially with an Urborg, Tomb of Yawgmoth somewhere on the battlefield, but not one Id rely on in an emergency
But theres some tension here with the costs of instants and sorceries, as you want at least three different mana values among spells in your graveyard so your commanders mana value is discounted by 6, but you want them to be as cheap as possible
5 Second Harvest And don't forget elevenses, luncheon, and afternoon tea harvests
You do want to have some source of lifegain in your deck, as Darkstar Augur will cause you quite a bit of burn damage