Mysteries of the Deep 
Instant
$0.16 #22891 0.31 16.7 years
Draw two cards.
Landfall — If you had a land enter the battlefield under your control this turn, draw three cards instead.
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Cards similar to Mysteries of the Deep 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.
Rest for the Weary87%
$0.17↑#14799↑0.00↓16.7 years
"If you had a land enter the battlefield under your control this turn, that player gains 8 life instead."
Tidings84%
$0.29↑#16946↑0.00↓27.3 years↑
"Draw four cards."
Mind Spring83%
$0.27↑#5199↑0.00↓18.7 years↑
"Draw X cards."
Groundswell81%
$0.31↑#8463↑0.05↓16.7 years
"If you had a land enter the battlefield under your control this turn, that creature gets +4/+4 until end of turn instead."
Tomb Hex80%
$0.18↑#273060.07↓16.7 years
"If you had a land enter the battlefield under your control this turn, that creature gets -4/-4 until end of turn instead."
Divination80%
$0.07↓#6283↑0.00↓17.3 years
"Draw two cards."
Weave Fate80%
$0.09↓#235650.00↓12.1 years↓
"Draw two cards."
Quick Study80%
$0.24↑#2636↑0.09↓3.1 years↓
"Draw two cards."
Touch of Brilliance80%
$0.12↓#30376↓0.00↓29.5 years↑
"Draw two cards."
Counsel of the Soratami80%
$0.10↓#17637↑0.00↓22.1 years↑
"Draw two cards."
River of Tears78%
$0.32↑#2766↑0.06↓19.5 years↑
"
: Add . If you played a land this turn, add 
instead."
: Add . If you played a land this turn, add instead."
Sphinx's Revelation78%
$0.29↑#3381↑0.13↓14.0 years↓
"You gain X life and draw X cards."
Contact Other Plane77%
$0.18↑#8591↑0.245.2 years↓
"Draw two cards."
Boon of the Wish-Giver76%
$0.19↑#7381↑0.00↓6.5 years↓
"Draw four cards."
Tatyova, Benthic Druid74%
$0.21↑#483↑0.87↑8.5 years↓
"Whenever a land you control enters, you gain 1 life and draw a card."
Wandering Troubadour74%
$0.17↑#17154↑0.00↓5.2 years↓
"At the beginning of your end step, if you had a land enter the battlefield under your control this turn, venture into the dungeon."
Ondu Greathorn74%
$0.03↓#28296↓0.00↓11.0 years↓
"Whenever a land you control enters, this creature gets +2/+2 until end of turn."
Territorial Baloth74%
$0.06↓#223660.00↓17.0 years
"Whenever a land you control enters, this creature gets +2/+2 until end of turn."
Valakut Predator74%
$0.05↓#239520.18↓11.0 years↓
"Whenever a land you control enters, this creature gets +2/+2 until end of turn."
Plated Geopede74%
$0.14↓#233300.00↓17.0 years
"Whenever a land you control enters, this creature gets +2/+2 until end of turn."