Commander Spock 
Legendary Creature — Vulcan Human Scientist
$0.43 #23536 0.0 years
Strange new worlds — Whenever Commander Spock enters or attacks, reveal the top card of your library. You may cast that card without paying its mana cost if that spell's mana value is equal to or less than the number of differently named lands you control. If it's a land card, you may put it onto the battlefield tapped. If that card is still on top of your library, draw a card.
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Cards similar to Commander Spock 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.
Yennett, Cryptic Sovereign78%
$0.50↑#8179↑0.678.3 years↑
"Whenever this card attacks, reveal the top card of your library. You may cast it without paying its mana cost if its mana value is odd. If you don't cast it, draw a card."