Helm of Possession 
Artifact
$4.94 #14907 0.59 28.9 years
You may choose not to untap this artifact during your untap step.
, 
, Sacrifice a creature: Gain control of target creature for as long as you control this artifact and this artifact remains tapped.Click a line or tag to filter
Cards similar to Helm of Possession 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.
Rubinia Soulsinger90%
$0.38↓#19060↓0.48↓32.3 years↑
": Gain control of target creature for as long as you control this card and this card remains tapped."
: Gain control of target creature for as long as you control this card and this card remains tapped."+1 more matching line
Vedalken Shackles84%
$8.05↑#11656↑0.46↓22.3 years↓
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Piper of the Swarm81%
$0.46↓#3053↑0.25↓6.9 years↓
"
, , Sacrifice three Rats: Gain control of target creature."
, , Sacrifice three Rats: Gain control of target creature."
Grafted Identity78%
$0.21↓#19042↓0.36↓4.9 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Ritual of the Machine78%
$9.02↑#18193↓0.5330.2 years↑
"As an additional cost to cast this spell, sacrifice a creature."
Infernal Denizen76%
$0.88↓#27339↓0.29↓31.3 years↑
": Gain control of target creature for as long as this creature remains on the battlefield."
: Gain control of target creature for as long as this creature remains on the battlefield."
Preacher75%
$29.26↑#22239↓0.88↑32.1 years↑
": For as long as this creature remains tapped, gain control of target creature of an opponent's choice they control."
: For as long as this creature remains tapped, gain control of target creature of an opponent's choice they control."+1 more matching line
Old Man of the Sea75%
$228.67↑#25932↓1.00↑32.7 years↑
"You may choose not to untap this creature during your untap step."
+1 more matching line
Sower of Temptation74%
$2.59↓#4030↑0.5218.9 years↓
"When this creature enters, gain control of target creature for as long as this creature remains on the battlefield."
Willow Satyr74%
$69.05↑#24235↓0.6032.3 years↑
": Gain control of target legendary creature for as long as you control this creature and this creature remains tapped."
: Gain control of target legendary creature for as long as you control this creature and this creature remains tapped."+1 more matching line
Callous Oppressor72%
$1.69↓#157160.47↓23.9 years↓
": Gain control of target creature that isn't of the chosen type for as long as this creature remains tapped."
: Gain control of target creature that isn't of the chosen type for as long as this creature remains tapped."+1 more matching line
Novice Dissector71%
$0.12↓#24055↓0.26↓5.4 years↓
"
, Sacrifice another creature: Put a +1/+1 counter on target creature. Activate only as a sorcery."
, Sacrifice another creature: Put a +1/+1 counter on target creature. Activate only as a sorcery."