Boon Reflection straight up doubles your life gain...something that Bilbo's first ability dreams it could do
The new mechanics and refreshed concepts in the expansion add depth to the game, making it more interesting for experienced players
The other exploit is with effects that trigger on (combat) damage to players
It has the Vedalken Orrery issue where you cross your fingers you untap with it, plus the Crucible of Worlds problem where its no longer unique
But even with a significant effort, it still wont be punching on the level of Hidden Strings Stella and worse, I suspect the inherent inconsistencies of the card will lower its fun ceiling as well
Card choices prioritize how pieces interact with your commander and with each other (e.g., self-mill as draw, modal spells for double Kess value) instead of blindly jamming the usual staples