Make some Humans into Allies

Allies were pretty narrow in BFZ. Without Lantern Scout or Veteran Warleader, they were practically unplayable.

The introduction of Humans into SoI provides an opportunity to broaden out the Ally theme. Any number of Human cards could be broadened out to include the extra subtype Ally, from Paranoid Parish-Blade to Odric, Lunarch Marshall. There's nothing wrong with having a 'Human Soldier Ally'.

What's neat about doing this is that it doesn't need the introduction of any new rules printed on the cards, so the new effects would be transparent to new players and would not complicate things until they were ready to see them in action in a deck.

It's true that Allies were supposed to be a unique BFZ mechanic in paper MTG, but this game is not paper MTG and can easily make little changes like this. Also, Landfall was also supposed to be a unique BFZ mechanic, and I see that has been reused in SoI.