Giant Harbinger 
Creature — Giant Shaman
$0.38 #15998 0.20 18.9 years
When this creature enters, you may search your library for a Giant card, reveal it, then shuffle and put that card on top.
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Cards similar to Giant Harbinger 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.
Ancient Amphitheater74%
$0.29↓#11619↑0.10↓18.9 years
"As this land enters, you may reveal a Giant card from your hand. If you don't, this land enters tapped."