Okay, so I ended up cutting the neutral minion idea and reducing my possible entries to the other two:
Call of the Hunt / Feral Allure / Unleash [?]
All minions are now Battlepets. They have no owner.
This card may be a little complicated, as it'd have some weird interactions with stuff like Aymara and Reaper of the Nine Moons (I guess Aymara's damage would proc on both generals and RNM would pull randomly from either deck and it's spawn would also become a ownerless Battlepet) but I'm really liking the idea. Do you guys think it's too problematic? Also which name do you prefer?
Your general gains +1 attack. Whenever your general attacks, reactivate friendly Battlepets.
I'm not completely sold on the cost and the attack increase as they stand, but this card seems balanced to me. After the proposed changes I can't think of any weird interactions with other cards, except the Zendo hard counter, although I'm not sure if it would work, considering his present text. I'm also open to name suggestions for this one...
I would really appreciated if you could tell which one you prefer and why, so I can use the input to decide what to go with before someone else posts similar ideas.