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It makes Looting scale well with other discard effects as well as any prowess style triggers you might have

Epistolary Librarian is an excellent go-wide payoff, using Veil of Time to cast spells from your hand without paying their mana costs if youre attacking with enough creatures

Some folks have argued that its a little too much like Upheaval in that the caster gets to float mana and do additional things (especially since the lands enter the battlefield untapped), but that analogy breaks down because the opponents also get to float mana and have untapped lands

It gives you another way to get the cards you want, and I think that would be worth it for most players