False Floor 
Artifact
$0.24 #19259 0.63 4.5 years
This artifact enters tapped.
Creatures enter tapped.
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Cards similar to False Floor 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.
Imposing Sovereign88%
$0.40↑#12509↑0.92↑13.3 years↑
"Creatures your opponents control enter tapped."
Urabrask the Hidden84%
$4.23↑#1793↑0.89↑15.4 years↑
"Creatures your opponents control enter tapped."
Radiant Grace // Radiant Restraints84%
$0.30↑#13041↑0.18↓4.9 years
"Creatures enchanted player controls enter tapped."
Authority of the Consuls83%
$3.87↑#312↑1.44↑10.1 years↑
"Creatures your opponents control enter tapped."
Ashling's Prerogative75%
$0.63↑#182480.47↓19.0 years↑
"Each creature without mana value of the chosen quality enters tapped."
Thalia, Heretic Cathar75%
$0.88↑#1486↑1.22↑10.2 years↑
"Creatures and nonbasic lands your opponents control enter tapped."
Cone of Cold73%
$0.29↑#6925↑0.45↓4.4 years
"Tap all creatures your opponents control. Those creatures don't untap during their controllers' next untap steps. Until your next turn, creatures your opponents control enter tapped."
Shrieking Mogg72%
$0.54↑#25468↓0.37↓26.7 years↑
"When this creature enters, tap all other creatures."
Blind Obedience72%
$4.83↑#505↑1.28↑13.7 years↑
"Artifacts and creatures your opponents control enter tapped."
The Echoverse Fulcrum72%
$2.10↑#181090.23↓0.0 years↓
"
,
, Exile this card: Destroy all creatures. Activate only as a sorcery."
Subjugator Angel72%
$0.31↑#9439↑0.33↓10.2 years↑
"When this creature enters, tap all creatures your opponents control."
Spider-Woman, Stunning Savior72%
$1.86↑#5254↑1.06↑1.1 years↓
"Artifacts and creatures your opponents control enter tapped."
Loxodon Gatekeeper71%
$1.26↑#12458↑1.19↑21.0 years↑
"Artifacts, creatures, and lands your opponents control enter tapped."