Each of your end steps, the enchantment takes back 1/3rd of what it has given you, and if it ever leaves the battlefield, it takes it all back at once
The adventure doesnt stop here dive into the full list for juicy details, gameplay strategies, and tips to hunt down these treasures for your collection

Academic Dispute Animate Object Arcane Subtraction Burning Wish Coax from the Blind Eternities Collector Protector Cover the Spot Cover the Spot Cover the Spot Cover the Spot Cram Session Cunning Wish Dart Throw Dart Throw Dart Throw Dart Throw Death Wish Divide by Zero Dream Strix Enthusiastic Study Eyetwitch Fae of Wishes Fae of Wishes Field Trip First Day of Class Glittering Wish Gnarled Professor Golden Wish Grizzled Huntmaster Guiding Voice Hunt for Specimens Igneous Inspiration Karn, the Great Creator Knife and Death Living Wish Mastermind's Acquisition North Wind Avatar Overgrown Arch Photo Op Poet's Quill Pop Quiz Professor of Symbology Research // Development Research // Development Retriever Phoenix Ring of Ma'rf Rise of Extus Sparring Regimen Spawnsire of Ulamog Spike, Tournament Grinder Study Break The Raven's Warning Vivien, Arkbow Ranger Wish Wizened Arbiter (playtest)
"Let the vampires join us
The honest answer is: it depends entirely on what you buy, how you buy it, how long you hold it, and whether you genuinely understand what you are doing