Mysteries of the Deep 
Instant
$0.14 #22582 0.38 16.6 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%
$0.20↑#14719↑0.05↓16.6 years
"If you had a land enter the battlefield under your control this turn, that player gains 8 life instead."
Tidings84%
$0.27↑#16728↑0.00↓27.2 years↑
"Draw four cards."
Mind Spring84%
$0.25↑#5075↑0.10↓18.6 years↑
"Draw X cards."
Tomb Hex82%
$0.17↑#270760.3316.6 years
"If you had a land enter the battlefield under your control this turn, that creature gets -4/-4 until end of turn instead."
Groundswell81%
$0.30↑#8328↑0.50↑16.6 years
"If you had a land enter the battlefield under your control this turn, that creature gets +4/+4 until end of turn instead."
Counsel of the Soratami80%
$0.12↓#17367↑0.00↓21.9 years↑
"Draw two cards."
Weave Fate80%
$0.11↓#233020.00↓11.9 years↓
"Draw two cards."
Divination80%
$0.07↓#6202↑0.00↓17.1 years
"Draw two cards."
Quick Study80%
$0.25↑#2650↑0.09↓3.0 years↓
"Draw two cards."
Touch of Brilliance80%
$0.13↓#30071↓0.3629.3 years↑
"Draw two cards."
River of Tears78%
$0.34↑#2680↑0.12↓19.3 years↑
"
: Add . If you played a land this turn, add 
instead."
: Add . If you played a land this turn, add instead."
Sphinx's Revelation78%
$0.34↑#3373↑0.15↓13.9 years↓
"You gain X life and draw X cards."
Contact Other Plane78%
$0.20↑#8428↑0.16↓5.1 years↓
"Draw two cards."
Boon of the Wish-Giver76%
$0.18↑#7258↑0.00↓6.4 years↓
"Draw four cards."
Necrologia76%
$0.35↑#9418↑0.3328.2 years↑
"Draw X cards."
Tatyova, Benthic Druid74%
$0.15↑#470↑0.82↑8.4 years↓
"Whenever a land you control enters, you gain 1 life and draw a card."
Wandering Troubadour74%
$0.16↑#16873↑0.335.1 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↓#28100↓0.4710.9 years↓
"Whenever a land you control enters, this creature gets +2/+2 until end of turn."
Grove Rumbler74%
$0.14#221790.23↓10.9 years↓
"Whenever a land you control enters, this creature gets +2/+2 until end of turn."
Valakut Predator74%
$0.05↓#236920.07↓10.9 years↓
"Whenever a land you control enters, this creature gets +2/+2 until end of turn."