It excels in Commander, which encourages you to play creatures large enough that this is mana neutral because somebody at Wizards thought that would be an okay ceiling and games go long enough to really milk the card advantage
Trying to keep pace with a Hierarch when playing a highly aggressive deck is a head slumping experience, and due to the lack of competition most decks with access to the colored mana would choose this over other creatures in the same price range
Other permanents include lands, enchantments, and creatures
Select this to be presented with the Flairs you have available, and then spend some Shinedust and duplicate cards on unlocking it
Void is much more difficult to trigger in Standard, which could ruin Hymns potential there, but it does work in some new potential shells supported by Edge of Eternities, like Aristocrats