Risen Reef 
Creature — Elemental
$0.31 #2156 0.35 7.2 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.
Parcelbeast86%
$0.22↓#7174↓0.286.4 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."
Skyward Eye Prophets82%
$0.10↓#24976↓0.00↓17.6 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."
Fecund Greenshell82%
$0.72↑#2807↓0.272.1 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."
Skyclave Aerialist // Skyclave Invader78%
$0.14↓#25256↓0.06↓3.4 years↓
"When this creature transforms into Skyclave Invader, 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 Thresher78%
$0.25↓#10461↓0.09↓1.9 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 Genesis76%
$0.36↑#1480↑0.16↓2.2 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 Oracle74%
$0.13↓#1349↑0.14↓20.7 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 Lookout74%
$0.37↑#5533↓0.50↑2.4 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 Rejuvenator72%
$0.09↓#5267↓0.438.1 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."
N'Yami-Class Mother Ship71%
$0.55↑#12606↓0.00↓0.2 years↓
"Whenever this Vehicle deals combat damage to a player, look at the top card of your library. If it's a permanent card, you may put it onto the battlefield. If you don't put it onto the battlefield, put it into your hand."
Thrasios, Triton Hero70%
$19.52↑#25061.34↑9.8 years↑
"
: Scry 1, then reveal the top card of your library. If it's a land card, put it onto the battlefield tapped. Otherwise, draw a card."
: Scry 1, then reveal the top card of your library. If it's a land card, put it onto the battlefield tapped. Otherwise, draw a card."
Raiders' Karve70%
$0.15↓#9489↓0.24↓5.6 years↓
"Whenever this Vehicle attacks, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped."