Defender only prevents the creature from being declared as an attacker, which doesnt happen with fight effects like Ancient Animus, Pit Fight, and Longstalk Brawl
The action description on the card states that when the player casts a noncreature spell they can put a +1/+1 counter on any other Dorat cards, which due to the cards already having 1/1 stats would mean that the player would need to play a lot of the same Dorat cards to be any threat to their opponents.
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That said, it is a battle, it's cheap, and it fills the graveyard, which could be relevant in decks with a card-type-matters theme built around Atraxa, Grand Unifier or Tarmogoyf
Thanks to its haste, unless your opponent(s) has removal or a blocker ready for Bladewing, its effect is going off
