Stinging Lionfish {1}{U}
Enchantment Creature — Fish
Whenever you cast your first spell during each opponent's turn, you may tap or untap target nonland permanent.
click a line to search just that ability, click more to combine them
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.
Component Collector 96%
$0.09#26144
"Whenever day becomes night or night becomes day, you may tap or untap target nonland permanent."
Merrow Reejerey 91%
$0.24#3998
"Whenever you cast a Merfolk spell, you may tap or untap target permanent."
Telekinetic Bonds 89%
$0.33#28251
"Whenever a player discards a card, you may pay {1}{U}. If you do, you may tap or untap target permanent."
Tidal Force 89%
$0.48#16453
"At the beginning of each upkeep, you may tap or untap target permanent."
Toils of Night and Day 86%
$0.17#17859
"You may tap or untap target permanent, then you may tap or untap another target permanent."
Hidden Strings 86%
$0.25#4303
"You may tap or untap target permanent, then you may tap or untap another target permanent."
Curse of Inertia 84%
$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 82%
$0.16#22227
"When this creature is turned face up, you may tap or untap target permanent."