I originally thought that it could only be played in battle as an enh but when I read it again it appeared that that portion could be triggered once a hero begins a battle as the definition of play includes activating a card's ability. This, combined with the wording of "played during battle," made me believe it could be a delayed trigger. I also thought the same as what Aggie said in that if it was meant to be played as an enh only the wording should have been "played IN battle," not "during." That "during" word is obviously what made me think that it could be triggered later.
Anyways, thanks gents.