
I think Beorn, as much as I love it, is a little too Magical Christmas Land for me
The real magical Christmas land is wombo comboing your
Kudo, King Among Bears with Beorn.
While not needing any typal payoffs, I do think these cards are more fun when there are other cards sprinkled throughout the cube to work with them. Unfortunately I'm not running any bears, but Kudo,
Wilson, Refined Grizzly,
Hurska Sweet-Tooth, and
Lumra, Bellow of the Woods are all other bears I wouldn't mind running on their own. Also shout-out to
Doric, Nature's Warden who turns into a bear.
It's probably a lesser powered card on average, but I think I prefer
Sauron, Dino Devotee in this slot instead, and wouldn't run both as they have such similar effects.
Speaking of typal payoffs, here's one I'm closer to including, if it weren't for the color identity. Everything it does is mono green card at heart, and plays well into a lot of those decks. It's a premier 3MV reanimation target, makes tokens for go wide, provides good sacrifice fodder, and turns on power 4 or greater, with trample providing a good place to put counters.
I might proxy this as



or



just for an excuse to run it. I was already trying to find space for
Titania, Rugged Rumbler (another primo
Unearth payoff) but this might take her place instead.
Really though I just wanted to talk wolves!
Torgal, A Fine Hound,
Summon: Fenrir,
Nightpack Ambusher,
Cemetery Prowler and
Ranger Class are all banger wolves in green. Honorary mentions to
Young Wolf,
Master of the Wild Hunt as well. Lastly,
Faldorn, Dread Wolf Herald,
Arlinn Kord,
Garruk Relentless, and
Tolsimir, Friend to Wolves all make for interesting splash options.
I don't think you need all of these of course, but a few allow for interesting payoffs that aren't going to railroad your drafts in the way other 'types matter' cards do.

To thematically round this out, I don't support goblins but I think this will perform better than
Young Pyromancer on it's own merit. Having this be your only amass card is basically an upside, compared to most mechanics that are more deterimental for running on their own. I had been thinking of trying
Molten-Core Maestro, but triggering off noncreature spells instead of Instants/Sorceries is just such a huge upside lately. I expect this one to become a cube stable.