Hi,
I will reply the same answer as in an other topic:To my mind, Kalia should be a light deck with some overkill angels, dragons and demons. (like
Master of Cruelties or
Iona, Shield of Emeria)
Otherwise you risk to face an opening hand with too many high cost cards.
So, you want to find these cards when you need them with tutor cards like
Demonic Tutor, or draw cards.
The deck thus lose some funny splashy things but you get a more subtile one where you can add some removals or utility cards, especially if you play 1 VS 1.
If not, you can indeed add some bigger cards to face multiple opponents.
I would say that 15 creatures are enough in this type of deck. (and your average mana cost should be between 3,5 and 4, depending on multiplayer or not)
The aim in Magic is not only to make your plays but also to prevent the opponent to make his, that's why you need a versatile deck (with the black colour it's easier
)