Amulet of Safekeeping 
Artifact
$0.41 #17077 0.35 8.3 years
Whenever you become the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays
.
Creature tokens get -1/-0.
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Cards similar to Amulet of Safekeeping expected a card that isn't here?
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Unsettled Mariner81%
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"Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays
."
Parnesse, the Subtle Brush81%
$0.38↓#169740.404.5 years↓
"Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless that player pays 4 life."
Frost Titan80%
$0.45↑#9965↑0.19↓16.3 years↑
"Whenever this creature becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays
."
Diffusion Sliver78%
$1.74↑#4335↑1.11↑12.3 years↑
"Whenever a Sliver creature you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays
."
Mouth of the Storm76%
$0.15↓#23314↓0.12↓1.2 years↓
"When this creature enters, creatures your opponents control get -3/-0 until your next turn."
Reality Smasher76%
$0.76↑#10679↑0.16↓10.7 years↑
"Whenever this creature becomes the target of a spell an opponent controls, counter that spell unless its controller discards a card."
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"Creatures your opponents control get -2/-0 until end of turn."
Hysterical Blindness76%
$0.07↓#28433↓0.3315.1 years↑
"Creatures your opponents control get -4/-0 until end of turn."
Reidane, God of the Worthy // Valkmira, Protector's Shield74%
$0.41#6442↑0.53↑5.7 years↓
"Whenever you or another permanent you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays
."