Merrow Harbinger 
Creature — Merfolk Wizard
$2.86 #9238 0.07 18.9 years
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
When this creature enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.
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Cards similar to Merrow Harbinger 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.
Forerunner of the Heralds99%
$0.36↓#94160.37↑8.6 years↓
"When this creature enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top."
Seahunter80%
$3.62↑#11379↓0.48↑26.6 years↑
", 
: Search your library for a Merfolk permanent card, put it onto the battlefield, then shuffle."
, : Search your library for a Merfolk permanent card, put it onto the battlefield, then shuffle."
Sygg, River Guide79%
$1.85↓#17868↓0.50↑18.9 years
"Islandwalk"
Wanderwine Hub76%
$0.83↓#13800↓0.0518.9 years
"As this land enters, you may reveal a Merfolk card from your hand. If you don't, this land enters tapped."
Jade Bearer72%
$0.06↓#22477↓0.25↑8.6 years↓
"When this creature enters, put a +1/+1 counter on another target Merfolk you control."
Jade Guardian71%
$0.17↓#25347↓0.65↑8.9 years↓
"When this creature enters, put a +1/+1 counter on target Merfolk you control."
Treefolk Harbinger70%
$6.68↑#85010.36↑18.9 years
"When this creature enters, you may search your library for a Treefolk or Forest card, reveal it, then shuffle and put that card on top."