It is also notable for its distinctive ability in Commander
Thats up to two extra lore gained each turn, and on top of the two lore theyre already questing for, you can quickly rack up a respectable amount while keeping your other characters in tip-top shape
I love this with Commanders with evasion already like Azorius's Brago, King Eternal that flies or getting trample as a modified dork with Kodama of the West Tree
Most of your characters have good stats for banishing their rivals in challenges, and if they don't there are easy ways to pump them up, either with a song, or as the side effect of a song
For 3 mana, Eternal Witness lets you return any card from your graveyard to your hand, and also provides a 2/1 body
Used in all formats, going even as far as Legacy