Case of the Uneaten Feast
Enchantment - Case
(CMC 1)
Whenever a creature enters the battlefield under your control, you gain 1 life.
To solve -- You've gained 5 or more life this turn. (If unsolved, solve at the beginning of your end step.)
Solved -- Sacrifice this Case: Creature cards in your graveyard gain "You may cast this card from your graveyard" until end of turn.
- [MKM] Murders at Karlov Manor #10 (R)