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In Teferis case, it rewards you with a doubling effect on any card you draw beyond the forced draw of the turn which in Blue decks is very easy to take advantage of (or even abuse)

It comes with a Staff of the Storyteller as "Yuna's Sending Staff"

Mental Misstep can also counter opposing copies of Mental Misstep to push through your own Ancestral Recall

Delver of Secrets is great because it turns into a flying monster fairly quickly

What this means is that basically any burn spell that would do more damage than necessary to kill a creature now converts that damage into direct burn, which is incredibly efficient