Crown of Doom 
Artifact
$2.55 #9056 0.44 11.8 years
Whenever a creature attacks you or a planeswalker you control, it gets +2/+0 until end of turn.
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Cards similar to Crown of Doom expected a card that isn't here?
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Jinxed Choker88%
$2.40↓#11523↓0.4522.9 years↑
"At the beginning of your end step, target opponent gains control of this artifact and puts a charge counter on it."
Witch Hunt88%
$0.38↓#16048↓0.21↓12.8 years↑
"At the beginning of your end step, target opponent chosen at random gains control of this enchantment."
Sleeper Agent82%
$1.69↓#11715↓0.20↓27.9 years↑
"When this creature enters, target opponent gains control of it."
Jinxed Idol82%
$1.02↓#94770.64↑28.9 years↑
"Sacrifice a creature: Target opponent gains control of this artifact."
Jinxed Ring82%
$3.12↑#13772↓0.22↓28.5 years↑
"Sacrifice a creature: Target opponent gains control of this artifact."
Akroan Horse81%
$0.45↓#4451↑0.11↓12.9 years↑
"When this creature enters, an opponent gains control of it."
Gahiji, Honored One80%
$0.38↓#11716↓0.06↓12.8 years↑
"Whenever a creature attacks one of your opponents or a planeswalker an opponent controls, that creature gets +2/+0 until end of turn."
Crag Saurian79%
$0.45↓#28873↓0.33↓26.9 years↑
"Whenever a source deals damage to this creature, that source's controller gains control of this creature."
Risky Move78%
$1.22↓#11918↓0.65↑23.9 years↑
"At the beginning of each player's upkeep, that player gains control of this enchantment."
Measure of Wickedness78%
$0.29↓#25536↓0.76↑21.3 years↑
"Whenever another card is put into your graveyard from anywhere, target opponent gains control of this enchantment."
Bazaar Trader76%
$6.29↑#7009↑0.3516.6 years↑
"
: Target player gains control of target artifact, creature, or land you control."
Goblin Cadets76%
$2.15↓#11935↓0.00↓27.9 years↑
"Whenever this creature blocks or becomes blocked, target opponent gains control of it."
Captive Audience76%
$4.24↑#74901.00↑7.6 years↓
"This enchantment enters under the control of an opponent of your choice."
Act of Authority76%
$0.87↓#14558↓0.56↑12.8 years↑
"At the beginning of your upkeep, you may exile target artifact or enchantment. If you do, its controller gains control of this enchantment."
Witch Engine75%
$0.27↓#23210↓0.00↓27.9 years↑
"
: Add 


. Target opponent gains control of this creature."
Humble Defector75%
$0.12↓#1783↑0.17↓11.6 years
"
: Draw two cards. Target opponent gains control of this creature. Activate only during your turn."
Vislor Turlough75%
$0.24↓#12377↓0.72↑2.9 years↓
"When this card enters, you may have an opponent gain control of it. If you do, it's goaded for as long as they control it."
Contested War Zone75%
$0.30↓#14619↓0.07↓15.6 years↑
"Whenever a creature deals combat damage to you, that creature's controller gains control of this land."
+1 more matching line
Ghazbán Ogre74%
$0.11↓#30659↓0.27↓32.7 years↑
"At the beginning of your upkeep, if a player has more life than each other player, the player with the most life gains control of this creature."