Bolas's Citadel 



Legendary Artifact
You may look at the top card of your library any time.
You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost.
{T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.
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Cards that do something similar 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.
One with the Multiverse 95%
$2.01#1914
"You may play lands and cast spells from the top of your library."
+1 more matching line
Experimental Frenzy 95%
$0.32#13755
"You may play lands and cast spells from the top of your library."
+1 more matching line
Future Sight 95%
$0.39#7280
"You may play lands and cast spells from the top of your library."
+1 more matching line
Magus of the Future 95%
$0.36#13882
"You may play lands and cast spells from the top of your library."
+1 more matching line
Radha, Heart of Keld 84%
$0.54#7832
"You may look at the top card of your library any time, and you may play lands from the top of your library."
Crystal Skull, Isu Spyglass 84%
$1.90#1920
"You may play historic lands and cast historic spells from the top of your library."
+1 more matching line
Verge Rangers 83%
$0.30#5354
"As long as an opponent controls more lands than you, you may play lands from the top of your library."
+1 more matching line
Augur of Autumn 82%
$0.32#1124
"You may play lands from the top of your library."
+1 more matching line
Ka-Zar of the Savage Land 82%
$0.24#20449
"You may play lands from the top of your library."
+1 more matching line
Courser of Kruphix 82%
$2.15#1229
"You may play lands from the top of your library."
+1 more matching line
Oracle of Mul Daya 82%
$2.54#499
"You may play lands from the top of your library."
+1 more matching line
Lens of Clarity 86%
$0.07#19422
"You may look at the top card of your library and at face-down creatures you don't control any time."
Reason // Believe 85%
$0.23#14979
"Look at the top card of your library. You may put it onto the battlefield if it's a creature card. If you don't, put it into your hand."