Secretkeeper 
Creature — Spirit
$0.15 #31500 0.00 21.3 years
As long as you have more cards in hand than each opponent, this creature gets +2/+2 and has flying.
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Cards similar to Secretkeeper 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.
Okina Nightwatch91%
$0.19↑#315530.27↑21.7 years
"As long as you have more cards in hand than each opponent, this creature gets +3/+3."
Descendant of Kiyomaro79%
$0.11↓#311470.0021.3 years
"As long as you have more cards in hand than each opponent, this creature gets +1/+2 and has "Whenever this creature deals combat damage, you gain 3 life.""
Aerial Engineer77%
$0.05↓#275550.11↑8.1 years↓
"As long as you control an artifact, this creature gets +2/+0 and has flying."
Hookblade Veteran77%
$0.23↑#12142↑0.17↑2.2 years↓
"During your turn, this creature has flying."
Daggersail Aeronaut77%
$0.04↓#24470↑0.36↑7.2 years↓
"During your turn, this creature has flying."
Roc Hatchling74%
$0.27↑#298280.53↑29.2 years↑
"As long as this creature has no shell counters on it, it gets +3/+2 and has flying."
Skyhunter Cub72%
$0.07↓#259480.53↑22.9 years↑
"As long as this creature is equipped, it gets +1/+1 and has flying."
Kitesail Apprentice72%
$0.13↓#25130↑0.44↑16.6 years↓
"As long as this creature is equipped, it gets +1/+1 and has flying."
Lightwalker72%
$0.02↓#274860.0711.4 years↓
"This creature has flying as long as it has a +1/+1 counter on it."
Esper Stormblade72%
$0.27↑#256820.0517.3 years↓
"As long as you control another multicolored permanent, this creature gets +1/+1 and has flying."
Ivory Tower70%
$0.20↑#5824↑0.36↑32.5 years↑
"At the beginning of your upkeep, you gain X life, where X is the number of cards in your hand minus 4."
Aeronaut Tinkerer70%
$0.03↓#274230.23↑12.1 years↓
"This creature has flying as long as you control an artifact."
Reaper of Night // Harvest Fear70%
$0.12↓#24174↑0.056.9 years↓
"Whenever this creature attacks, if defending player has two or fewer cards in hand, it gains flying until end of turn."
Auriok Sunchaser70%
$0.17↑#272820.29↑15.9 years↓
"As long as you control three or more artifacts, this creature gets +2/+2 and has flying."