{R} Case of the Shifting Visage [Murders at Karlov Manor Commander][MKC 019]

Title
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Set: Murders at Karlov Manor Commander
Type: Enchantment — Case
Rarity: Rare
Cost: {1}{U}{U}
At the beginning of your upkeep, surveil 1.
To solve — There are fifteen or more cards in your graveyard. (If unsolved, solve at the beginning of your end step.)
Solved — Whenever you cast a nonlegendary creature spell, copy that spell. (The copy becomes a token.)