Library of Leng 
Artifact
$3.36 #3012 0.38 33.1 years
You have no maximum hand size.
If an effect causes you to discard a card, discard it, but you may put it on top of your library instead of into your graveyard.
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Cards similar to Library of Leng expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Graceful Adept89%
$0.52↓#14799↓0.4621.9 years↓
"You have no maximum hand size."
Reliquary Tower86%
$3.58↑#10↑0.20↓17.6 years↓
"You have no maximum hand size."
Spellbook84%
$2.72↓#1932↑0.18↓28.2 years↓
"You have no maximum hand size."
Venser's Journal83%
$9.07↑#1988↑0.2815.9 years↓
"You have no maximum hand size."
Thought Vessel82%
$2.44↓#21↑0.27↓10.8 years↓
"You have no maximum hand size."
Reed Richards, Smartest Man82%
$0.47↓#14387↓0.00↓0.2 years↓
"You have no maximum hand size."
Niv-Mizzet, Visionary80%
$6.59↑#2213↑0.89↑1.8 years↓
"You have no maximum hand size."
Vnwxt, Verbose Host80%
$0.40↓#34730.27↓1.6 years↓
"You have no maximum hand size."
Proft's Eidetic Memory80%
$2.14↓#1762↑0.27↓2.6 years↓
"You have no maximum hand size."
Minamo Scrollkeeper80%
$0.09↓#27047↓0.3621.3 years↓
"Your maximum hand size is increased by one."
Wizard Class79%
$3.05↓#630↑0.16↓5.1 years↓
"You have no maximum hand size."
Curiosity Crafter79%
$0.34↓#1710↑0.25↓5.4 years↓
"You have no maximum hand size."
Triskaidekaphile79%
$1.01↓#1464↑0.474.9 years↓
"You have no maximum hand size."
Roaring Furnace // Steaming Sauna79%
$0.35↓#6621↓0.10↓1.9 years↓
"You have no maximum hand size."
Decanter of Endless Water78%
$2.46↓#315↑0.294.2 years↓
"You have no maximum hand size."
Morska, Undersea Sleuth78%
$0.25↓#8765↓0.26↓2.6 years↓
"You have no maximum hand size."
Tishana, Voice of Thunder77%
$0.37↓#5511↓0.398.9 years↓
"You have no maximum hand size."
Body of Knowledge76%
$0.33↓#2089↑0.345.8 years↓
"You have no maximum hand size."
Kruphix, God of Horizons76%
$3.22↓#4725↓0.24↓12.3 years↓
"You have no maximum hand size."
Ms. Marvel, Kamala Khan76%
$0.28↓#15774↓0.00↓0.2 years↓
"You have no maximum hand size."