This is harder to evaluate ahead of time, but it tends to track with how playable a card is in the format its aimed at
Nesting Grounds can move lore counters between Sagas, or just ditch a lore counter somewhere useless to 'rewind' a Saga to an earlier chapter, effectively letting you repeat the same chapters over and over
Here we are, the dawn of a new set
Since you're in Jund colors, you have access to a few more spells and creatures that let you increase the power of your creatures when you attack, letting you put your opponents on the ropes
It's still just better than a Staple-level card in Naturalize, with some Counterspell-esque and damage-dealing / combat add-ons
I understand not everyone can be a rare, but now it comes down to who can be