Underwater Tunnel // Slimy Aquarium 
// 
Enchantment — Room // Enchantment — Room
$0.12 #12032 0.00 2.1 years
When you unlock this door, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
When you unlock this door, manifest dread, then put a +1/+1 counter on that creature.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
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Cards similar to Underwater Tunnel // Slimy Aquarium 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.
Dimir Informant96%
$0.15↑#24534↓0.008.0 years↑
"When this creature enters, surveil 2."
Imperious Inkmage96%
$0.06↓#25161↓0.13↑0.5 years↓
"When this creature enters, surveil 2."
A.I.M. Synthoids96%
$0.15↑#19059↓0.20↑0.3 years↓
"When this creature enters, surveil 2."
Sterling Hound96%
$0.15↑#17644↓0.12↑2.5 years
"When this creature enters, surveil 2."
Whisper Agent96%
$0.09↓#24223↓0.068.0 years↑
"When this creature enters, surveil 1."
Sanitation Automaton96%
$0.08↓#22572↓0.002.7 years
"When this creature enters, surveil 1."
Watcher in the Mist96%
$0.05↓#28287↓0.008.0 years↑
"When this creature enters, surveil 2."
Wreckage Wickerfolk96%
$0.16↑#141370.001.7 years
"When this creature enters, surveil 2."
Shore Lurker96%
$0.08↓#24428↓0.070.7 years↓
"When this creature enters, surveil 1."
Barrier of Bones95%
$0.10↓#15296↓0.068.0 years↑
"When this creature enters, surveil 1."
Semester Foreseer // Peer Review94%
$0.15↑#24492↓0.010.0 years↓
"When this creature enters, surveil 1."
Rubblebelt Maverick94%
$0.20↑#18724↓0.12↑2.7 years
"When this creature enters, surveil 2."
Seekers' Squire92%
$0.11↓#25273↓0.009.1 years↑
"When this creature enters, it explores."
Tishana's Wayfinder92%
$0.20↑#21342↓0.009.1 years↑
"When this creature enters, it explores."
Merfolk Branchwalker92%
$0.20↑#16998↓0.009.1 years↑
"When this creature enters, it explores."
Cenote Scout92%
$0.20↑#118160.002.9 years
"When this creature enters, it explores."
Emissary of Sunrise92%
$0.12#28041↓0.009.1 years↑
"When this creature enters, it explores."
River Herald Guide92%
$0.09↓#18470↓0.24↑2.9 years
"When this creature enters, it explores."
Kinjalli's Dawnrunner92%
$0.09↓#23676↓0.002.9 years
"When this creature enters, it explores."
River Herald Scout92%
$0.13↑#17084↓0.002.9 years
"When this creature enters, it explores."