The Queen's Castle is perfect as it gains two lore passively at the start of your turn, and it comes with the ability, Using The Mirror
For that reason, I wouldnt be surprised if Sphere Grid dropped a bit in price once the novelty wears off, but it will likely always have a decent secondary market value because of the high likelihood for it to be synergistic with future Commander releases
Other Bonuses and Bundles Each of the drops has a regular bonus, but there is also a chance for a rare drop, one of the five pitch Elementals as Summons, and even if theres already plenty of sweet versions of these cards, them being rare and collectors items will keep the prices high
Elsa, Spirit of Winter, currently sells for around $950, while the non-Enchanted variant goes for about $12