Deepfathom Echo 
Creature — Merfolk Spirit
$0.26 #9953 0.12 2.9 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%
$0.64↑#12938↓0.44↑15.7 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%
$4.09↑#3406↑0.45↑0.6 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%
$0.17↓#25532↓0.119.1 years↑
"Whenever this creature deals combat damage to a player, it explores."
Jenny, Generated Anomaly79%
$0.26#19355↓0.29↑3.0 years
"Whenever this card deals combat damage to a player, it explores."
Kimahri, Valiant Guardian79%
$0.21↓#6902↑0.00↓1.4 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%
$0.29↑#89090.178.0 years↑
"When this card enters, surveil 1."
Seekers' Squire76%
$0.11↓#25273↓0.00↓9.1 years↑
"When this creature enters, it explores."
Tishana's Wayfinder76%
$0.20↓#21342↓0.00↓9.1 years↑
"When this creature enters, it explores."
Merfolk Branchwalker76%
$0.20↓#16998↓0.00↓9.1 years↑
"When this creature enters, it explores."
Cenote Scout76%
$0.20↓#118160.00↓2.9 years
"When this creature enters, it explores."
Emissary of Sunrise76%
$0.12↓#28041↓0.00↓9.1 years↑
"When this creature enters, it explores."
River Herald Guide76%
$0.09↓#18470↓0.24↑2.9 years
"When this creature enters, it explores."
Kinjalli's Dawnrunner76%
$0.09↓#23676↓0.00↓2.9 years
"When this creature enters, it explores."
River Herald Scout76%
$0.13↓#17084↓0.00↓2.9 years
"When this creature enters, it explores."
Pathfinding Axejaw76%
$0.20↓#16452↓0.132.9 years
"When this creature enters, it explores."
Brazen Buccaneers76%
$0.22↓#24483↓0.119.1 years↑
"When this creature enters, it explores."
Ixalli's Diviner76%
$0.18↓#22900↓0.25↑9.1 years↑
"When this creature enters, it explores."
Sunrise Seeker76%
$0.05↓#30215↓0.00↓9.1 years↑
"When this creature enters, it explores."
Seeker of Sunlight76%
$0.15↓#16901↓0.00↓2.9 years
": This creature explores. Activate only as a sorcery."
: This creature explores. Activate only as a sorcery."
Cemetery Puca76%
$2.76↑#19936↓0.0718.5 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."