After some thought, why not just give a Grizzly Eagle Wings? I can't see Valshalla operating as well with the BM as with the Priestess. With the Priestess, she offers tension between killing Clerics and killing her; in your build, there is no such tension and an opponent could just focus fire her without punishment.
I mean, it's an interesting idea, but competitively speaking I'm not so sure it would work out. I think including a couple Clerics to support a Gizzly, rather than a few small critters to support Valshalla, could be a better idea and less painful on your 120 point book limit. I think an "Animal Cult" build like your has potential, but I would recommend starting small with Clerics. I'd also recommend the combination of Wand of Healing and Staff of Beasts; it would make your bear nigh-unkillable.
I thought we were talking about teleport.
You're right that the Valshalla costs 6 more deck points over another Steelclaw. And actually, if I cut the angel I'd probably add in an Eagle Wings, another Force Hammer (or maybe 2 Geysers), a Poisoned Blood, and I'd swap the Bearskin for a Dragonscale Hauberk.
But in mana cost during play, Valshalla is actually a point cheaper than a pet Steelclaw (the book's other major opening), and the opportunity cost of the Eagle Wings on the Griz is Vampirism or Bear Strength or whatever on Valshalla.
My thinking is that I pay for book choices at the end of the game, when I run out of spells that I want to cast. I pay for creatures at the start of the game, and if I can win the first engagement decisively I can end the game before I have to pay for my book at all.
Similarly, in this book, I'd rather have 2x Heal than 1x Heal and 1x Mage Wand. Wands make sense for control books because they're re-useable and more versatile, but they're also slower and more mana-expensive than just stacking an extra heal in the deck, so I'm not in love with them for an agro book that needs to prioritize economy and speed.
Also, maybe things are different in other metas (mine's small and new), but wands seem to be choice targets for enemy dissolves. This deck, for example, packs 4x Dissolve, and has no intention of allowing an enemy to use a wand unless it's very late game (and if it's very late game, I've probably lost anyway).
All that said, here's a rough outline of the plan with Valshalla:
[ol]
[li](19) Walk, Ring of Beasts, Fox. -6[/li]
[li](22) Walk, Fox, -4[/li]
[li](27) Walk, Fox, Disruption to their anti creature strategy, whatever it is. (Agony or Disolve or Teleport, depending on who the enemy is). Foxes get into combat. [/li] -9 or -10.
[li](26) Valshalla. -21. First fox probably dies, Valshalla hopefully gets a counter. Nullify or Vampirism depending on available mana.[/li]
[/ol]
The version of this that uses the Falcons is similar, but with less disruption or less falcons.
Valshalla can obviously be cast on turn 3 if there's no good disruption target, but the goal is to provide the tension you talked about between killing foxes and attacking Valshalla. Asyran Clerics have healing and armor, but Foxes and Falcons have teeth and talons. And in this book, with no Lair, no Mana Flowers, and not even a Harmonize or a Moonglow Amulet, I'm looking for every point of damage I can get.