Well, you do get divided between including one or both intended target types, but at least you are only given four defense counters to transform this card
Personally, with Kastral, I would choose to give all my Birds +1/+1 counters whenever I deal combat damage
And that's where I suspect this card will fall
Jokes aside, this is pretty decent
As a 4/4 for 5 mana, its already a solid body, but the real value comes from its ability to tap and remove a +1/+1 counter from one of your creatures to deal 2 damage to any target
The first will force the targeted foe to draw three and discard three at random (good for discard punishing decks like Megrim), sacrifices a non-token artifact (not a Treasure, Clue, Blood, or Food), and the Balor shoots them for the damage to the cards in their hand (nice)