A week before the new set, what hasn't been explored enough?

What are some BLB cards that just feel under-used and should maybe get a shot at building a deck before DSK shakes things up again? What off-meta haven't you seen but think you should have seen?

My personal goals for deck builds in the next week...

1, Sunspine Lynx. I think I've seen one copy in constructed. Generally, elemental typal could be a thing now, right? Especially with Nissa for card drawing.

2, the two shapeshifters. I know about that Grim Captain combo, but how about a typal deck that needs those 2 more to reach critical mass? Lot of bad options: there few zombies but they lack any synergy payoffs, probably have enough playable Merfolk already, can't see a cheap dragon making a difference anywhere. Good options: they trigger Polukranos' flip side, maybe Hydra typal is viable? Use them as simultaneous elves+wolves with Voja? They are Mounts, so Miriam, the Gryff, Ranch... might be on to something with that last one...

3, resurrection deck. BLB gave us Dewdrop Cure and Zoraline and Jackdaw Savior, but haven't seen a new take on a sacrifice/rez deck. (Inspired by seeing Dewdrop used in a Botanical Brawler / Dusk Legion Duelist shell, which wasn't all that productive for my opponent but still got me thinking.)

What's on your BLB bucket list?