Helm of Possession 
Artifact
$4.86 #15096 0.43 29.0 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%
$0.37↓#19426↓0.63↑32.4 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 Shackles82%
$6.86↑#11860↑0.61↑22.4 years↓
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Piper of the Swarm81%
$0.52↓#3137↑0.30↓7.0 years↓
"
, , Sacrifice three Rats: Gain control of target creature."
, , Sacrifice three Rats: Gain control of target creature."
Grafted Identity76%
$0.15↓#19351↓0.505.1 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Ritual of the Machine76%
$10.01↑#18287↓0.28↓30.4 years↑
"As an additional cost to cast this spell, sacrifice a creature."
Infernal Denizen76%
$0.91↓#27630↓0.25↓31.4 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%
$29.37↑#22409↓0.55↑32.2 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%
$240.67↑#26094↓0.3832.8 years↑
"You may choose not to untap this creature during your untap step."
+1 more matching line
Sower of Temptation74%
$2.66↓#4108↑0.58↑19.0 years↓
"When this creature enters, gain control of target creature for as long as this creature remains on the battlefield."
Willow Satyr74%
$70.07↑#24445↓1.35↑32.4 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%
$1.66↓#159320.29↓24.0 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 Dissector70%
$0.13↓#24353↓0.00↓5.5 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."
Phyrexian Broodlings70%
$0.09↓#28149↓0.07↓27.7 years↓
", Sacrifice a creature: Put a +1/+1 counter on this creature."
, Sacrifice a creature: Put a +1/+1 counter on this creature."