Derevi, Empyrial Tactician 


Legendary Creature — Bird Wizard
$5.43 #2907 1.42 12.8 years
Flying
When Derevi enters and whenever a creature you control deals combat damage to a player, you may tap or untap target permanent.
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Cards similar to Derevi, Empyrial Tactician 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.
Pestermite84%
$0.25↓#10822↓0.50↓18.9 years↑
"When this creature enters, you may tap or untap target permanent."
Coral Trickster81%
$0.04↓#22568↓0.00↓19.9 years↑
"When this creature is turned face up, you may tap or untap target permanent."
Tidal Force80%
$0.51↓#16715↓0.13↓12.8 years
"At the beginning of each upkeep, you may tap or untap target permanent."
Toils of Night and Day75%
$0.17↓#18188↓0.10↓21.6 years↑
"You may tap or untap target permanent, then you may tap or untap another target permanent."
Telekinetic Bonds71%
$0.32↓#28625↓0.27↓24.3 years↑
"Whenever a player discards a card, you may pay 
. If you do, you may tap or untap target permanent."
Ghostly Touch71%
$0.21↓#19484↓0.47↓14.3 years↑
"Enchanted creature has "Whenever this creature attacks, you may tap or untap target permanent.""
Curse of Inertia71%
$0.29↓#14943↓0.24↓12.8 years
"Whenever a player attacks enchanted player with one or more creatures, that attacking player may tap or untap target permanent of their choice."
Cacophodon70%
$0.26↓#10920↓0.20↓8.6 years↓
"Whenever this creature is dealt damage, untap target permanent."
Ral Zarek70%
$0.70↓#6065↓0.59↓13.3 years
"+1: Tap target permanent, then untap another target permanent."
Hidden Strings70%
$0.29↓#4193↓0.33↓13.3 years
"You may tap or untap target permanent, then you may tap or untap another target permanent."