Risen Reef 
Creature — Elemental
$0.29 #2175 0.48 7.3 years
Whenever this creature or another Elemental you control enters, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. If you don't put the card onto the battlefield, put it into your hand.
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Cards similar to Risen Reef 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.
Parcelbeast85%
$0.17↓#7328↓0.00↓6.5 years
", 
: Look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand."
, : Look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand."
Fecund Greenshell82%
$0.86↑#2892↓0.16↓2.2 years↓
"Whenever this creature or another creature you control with toughness greater than its power enters, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. Otherwise, put it into your hand."
Skyward Eye Prophets81%
$0.09↓#25272↓0.00↓17.7 years↑
": Reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put it into your hand."
: Reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put it into your hand."
Skyclave Aerialist // Skyclave Invader78%
$0.15↓#25625↓0.00↓3.5 years↓
"When this creature transforms into this card, look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand."
Wickerfolk Thresher76%
$0.27↓#10955↓0.00↓2.1 years↓
"Whenever this creature attacks, if there are four or more card types among cards in your graveyard, look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand."
Planar Genesis74%
$0.38↑#1515↑0.08↓2.3 years↓
"Look at the top four cards of your library. You may put a land card from among them onto the battlefield tapped. If you don't, put a card from among them into your hand. Put the rest on the bottom of your library in a random order."
Coiling Oracle72%
$0.16↓#1399↑0.11↓20.8 years↑
"When this creature enters, reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put that card into your hand."
Freestrider Lookout72%
$0.37↑#5592↓0.12↓2.5 years↓
"Whenever you commit a crime, look at the top five cards of your library. You may put a land card from among them onto the battlefield tapped. Put the rest on the bottom of your library in a random order. This ability triggers only once each turn."
Elvish Rejuvenator70%
$0.08↓#5495↓0.00↓8.3 years
"When this creature enters, look at the top five cards of your library. You may put a land card from among them onto the battlefield tapped. Put the rest on the bottom of your library in a random order."