Ancient Amphitheater
Land
As this land enters, you may reveal a Giant card from your hand. If you don't, this land enters tapped.
{T}: Add {R} or {W}.
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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.
Temple of the Dragon Queen 81%
$0.31#2509
"As this land enters, you may reveal a Dragon card from your hand. This land enters tapped unless you revealed a Dragon card this way or you control a Dragon."
Tournament Grounds 85%
$0.25#11487
"{T}: Add {R}, {W}, or {B}. Spend this mana only to cast a Knight or Equipment spell."