You pay 4 less, so you can see how advantageous that can be, but it gets better
Learning the Strategies As you progress further into the game, unlock new decks, and add more powerful cards to your decks, you'll start facing more and more challenging opponents
Forsake the Worldly can do the job for 3 mana if that something is an artifact or enchantment, exiling it so you probably don't have to worry about it coming back
If that creature is legendary, draw a card
With Neera in play, you can choose to put the spell youre casting on the bottom of your library, and flip cards off of the top until you get a nonland card, which you can then cast for free
This might not be the set for you if you look to grow your collection