At its worst, you can use Nykthos to tap to for one colorless mana
While they are very powerful discard effects they don't do other things that easily fit into normal decks
That trend continued yesterday when Wizards of the Coast announced it would be celebrating War of the Spark's release with alternate art for its Japanese players
Finally, you pay the cost to use these cards during the game by using up Mana, a renewable resource produced primarily by Land cards
As for the card, it's a copy of Akroma's Will, an instant that lets you choose between all your creatures gaining flying, vigilance, and double strike, or lifelink, indestructible, and protection from each color until the end of the turn
We've already been over why the card is good and that's no different for this version