Case of the Shifting Visage
From Murders at Karlov Manor Commander set
Case of the Shifting Visage
Enchantment — Case
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.)