Select an enemy follower on the field. Deal it 3 damage and summon a Draconic Weapon token.
QIf my field is full, can I still play this spell to deal 3 damage to an enemy follower?
AYes. In that case, you simply wouldn't summon a Draconic Weapon token.
QIf there aren't any enemy followers on the field, can I still summon a Draconic Weapon token?
ANo. If you can't select an enemy follower on the field, you can't play this spell.