There are so many different directions to go with the two colors with no obvious best path
That said, even though its getting a bunch of new support in Final Fantasy, Bird Typal is hardly a powerhouse archetype
Cards like this that stick out as auto-inclusions tend to have steady value and I think that should be the same for Heirloom Blade
Keep drawing and keep casting spells for free
Enchantment - Aura Karmic Guide Flying, protection from black Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, return target creature card from your graveyard to the battlefield
Players wont blindly walk into it, which makes this much closer to an artifact version of Glorious Anthem