Merrow Reejerey {2}{U}
Creature — Merfolk Soldier
Other Merfolk creatures you control get +1/+1.
Whenever you cast a Merfolk spell, you may tap or untap target permanent.
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Cards that do something similar 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.
Stinging Lionfish 91%
$0.08#14066
"Whenever you cast your first spell during each opponent's turn, you may tap or untap target nonland permanent."
Component Collector 89%
$0.09#26144
"Whenever day becomes night or night becomes day, you may tap or untap target nonland permanent."
Telekinetic Bonds 88%
$0.33#28251
"Whenever a player discards a card, you may pay {1}{U}. If you do, you may tap or untap target permanent."
Curse of Inertia 86%
$0.40#14928
"Whenever a player attacks enchanted player with one or more creatures, that attacking player may tap or untap target permanent of their choice."
Coral Trickster 86%
$0.16#22227
"When this creature is turned face up, you may tap or untap target permanent."
Tidal Force 86%
$0.48#16453
"At the beginning of each upkeep, you may tap or untap target permanent."
Toils of Night and Day 85%
$0.17#17859
"You may tap or untap target permanent, then you may tap or untap another target permanent."
Hidden Strings 85%
$0.25#4303
"You may tap or untap target permanent, then you may tap or untap another target permanent."