commander mtg deck box sleeved cards plus extras like dice or tokens. Kraken MTG Commander Deck Box:

As part of the game's most recent reveal stream, Magic: The Gathering Strixhaven mechanics were on full display, and an exciting new one in the form of Learn and Lesson cards looks poised to inform deckbuilding decisions in interesting ways

In September 2020, a Mox Sapphire Beta Edition went for $12,100

Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a creature may become lethal if Eye of Nidhogg becomes attached to it or unattached from it during that turn

I find it also puts you in the light of an ally for a while since you "assisted" in removing a threat or two