Case of the Stashed Skeleton - 1B
Enchantment - Case (Rare)
When this Case enters the battlefield, create a 2/1 black Skeleton creature token and suspect it. (It has menace and can’t block.)
To solve - You control no susp ected Skeletons. (If unsolved, solve at the beginning of your end step.)
Solved - 1B, Sacrifice this Case: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery.
I really like the case mechanic.