It might not look like much at first glance, but Delver is so strong that they named an entire deck archetype after it in Magic's cheaper competitive format, Pauper
How about that land you lost to your Dust Bowl taking out a foe's Maze of Ith
This, combined with menace, means that she is very likely to have at least one target she can connect with
Hymn of Rebirth This one really stood out to me, mainly because it's such an oddball
The silver lining for this effect is that finding ways to recur dead creatures is often easier than lands, not to mention untapping them meaning you could generate absurd quantities of mana
However, despite being the hardest card to find, it isn't the one that is worth the most currently