Game Preserve 
Enchantment
$0.57 #26383 0.24 26.9 years
At the beginning of your upkeep, each player reveals the top card of their library. If all cards revealed this way are creature cards, put those cards onto the battlefield under their owners' control.
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Cards similar to Game Preserve 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.
Killer Instinct82%
$0.30↓#278710.13↓20.6 years↓
"At the beginning of your upkeep, reveal the top card of your library. If it's a creature card, put it onto the battlefield. That creature gains haste until end of turn. Sacrifice it at the beginning of the next end step."
Field of Dreams70%
$140.63↑#17465↑0.47↑32.3 years↑
"Players play with the top card of their libraries revealed."