First, WotC could tweak how the bonus sheet is implemented on MTGA: They have done it in the past, although it really seems extremely unlikely to happen here
Even if you dont get rid of the creature permanently, it can reset planeswalkers close to ulting, knock modifications off creatures, and just remove blockers to sneak in those last points of damage
With 5 Strength, 5 Willpower, and the Evasive keyword, he gathers 4 Lore when Questing, making him desirable despite the play cost
With enormous potential for powerful combos and the ability to manipulate both your own hand of cards and the options available to your opponents, Amethyst and Steel is the best Rise of the Floodborn starter deck for those players after something that builds more slowly towards massive game-winning turns
It is the kind of interaction that allows you to play good magic
Once you have enough Treasures, you can dump all that mana into a Hellkite Charger, and you have yourself an infinite combat loop