As far as I can tell you'll not often have multiple Armies on your side (though it is possible), even though - to me anyway - "Army" smells go-wide rather than go-tall
Spirits can be a powerful force on the battlefield, whether thats the mono-blue or Azorius tempo decks in various Constructed formats or some of the synergistic decks in Commander
Attack 2 : Swag If you win against a opponent you pick 2 prize cards
The change of typing might not seem like much, but it still takes Fire-type Energy instead of Darkness-type Energy
You can break this effect in something like Neera, Wild Mage by having a bunch of scry effects and expensive spells, but even then it could still easily backfire and kill you
You can't get cuter than Clefairy, but for Scarlet & Violet era players, it became a Pokemon to fear with Lillie's Clefairy EX