Deepfathom Echo 
Creature — Merfolk Spirit
$0.33 #9712 0.12 2.8 years
At the beginning of combat on your turn, this creature explores. Then you may have it become a copy of another creature you control until end of turn. (To have this creature explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)
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Cards similar to Deepfathom Echo 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.
Cryptoplasm84%
$0.63↑#12679↓0.0715.6 years↑
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Irma, Part-Time Mutant82%
$4.61↑#3753↑0.00↓0.5 years↓
"At the beginning of combat on your turn, this card becomes a copy of up to one other target creature you control, except her name is this card and she has this ability. Then put a +1/+1 counter on her."
Emperor's Vanguard79%
$0.18↓#25146↓0.29↑8.9 years↑
"Whenever this creature deals combat damage to a player, it explores."
Jenny, Generated Anomaly79%
$0.28↓#18926↓0.00↓2.9 years
"Whenever this card deals combat damage to a player, it explores."
Kimahri, Valiant Guardian79%
$0.25↓#7041↑0.28↑1.2 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on this card and tap target creature an opponent controls. Then you may have this card become a copy of that creature, except its name is this card and it has vigilance and this ability."
Lazav, the Multifarious78%
$0.30↓#86740.25↑7.9 years↑
"When this card enters, surveil 1."
Ixalli's Diviner76%
$0.17↓#22444↓0.058.9 years↑
"When this creature enters, it explores."
Emissary of Sunrise76%
$0.11↓#27663↓0.22↑8.9 years↑
"When this creature enters, it explores."
Tishana's Wayfinder76%
$0.19↓#21024↓0.44↑8.9 years↑
"When this creature enters, it explores."
Seekers' Squire76%
$0.12↓#25036↓0.29↑8.9 years↑
"When this creature enters, it explores."
River Herald Guide76%
$0.13↓#18045↓0.00↓2.8 years
"When this creature enters, it explores."
Merfolk Branchwalker76%
$0.26↓#16732↓0.55↑8.9 years↑
"When this creature enters, it explores."
Pathfinding Axejaw76%
$0.20↓#16000↓0.00↓2.8 years
"When this creature enters, it explores."
Kinjalli's Dawnrunner76%
$0.09↓#23194↓0.25↑2.8 years
"When this creature enters, it explores."
Cenote Scout76%
$0.24↓#115690.00↓2.8 years
"When this creature enters, it explores."
Sunrise Seeker76%
$0.05↓#29882↓0.29↑8.9 years↑
"When this creature enters, it explores."
River Herald Scout76%
$0.16↓#16685↓0.00↓2.8 years
"When this creature enters, it explores."
Brazen Buccaneers76%
$0.21↓#24142↓0.00↓8.9 years↑
"When this creature enters, it explores."
Cemetery Puca76%
$2.77↑#19602↓0.25↑18.3 years↑
"Whenever a creature dies, you may pay 
. If you do, this creature becomes a copy of that creature, except it has this ability."
. If you do, this creature becomes a copy of that creature, except it has this ability."
Cephalid Facetaker76%
$5.46↑#6836↑0.33↑4.4 years↑
"At the beginning of combat on your turn, you may have this creature become a copy of another target creature until end of turn, except it's 1/4 and has "This creature can't be blocked.""