Cyber Conversion 
Instant
$3.88 #4991 0.19 3.0 years
Turn target creature face down. It's a 2/2 Cyberman artifact creature.
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Cards similar to Cyber Conversion expected a card that isn't here?
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Backslide78%
$0.22↓#23194↓0.05↓24.0 years↑
"Turn target creature with a morph ability face down."
Illithid Harvester // Plant Tadpoles76%
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"When this creature enters, turn any number of target tapped nontoken creatures face down. They're 2/2 Horror creatures."
Master of the Veil74%
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"When this creature is turned face up, you may turn target creature with a morph ability face down."
Ixidron73%
$0.41↓#8048↓0.94↑20.0 years↑
"As this creature enters, turn all other nontoken creatures face down."
Weaver of Lies73%
$0.34↓#19866↓0.1523.7 years↑
"When this creature is turned face up, turn any number of target creatures with morph abilities other than this creature face down."
Ovinize72%
$0.07↓#17539↓0.39↑19.7 years↑
"Until end of turn, target creature loses all abilities and has base power and toughness 0/1."
Gift of Tusks71%
$0.09↓#23827↓0.06↓10.7 years↑
"Until end of turn, target creature loses all abilities and becomes a green Elephant with base power and toughness 3/3."
Diminish71%
$0.04↓#20043↓0.1716.3 years↑
"Target creature has base power and toughness 1/1 until end of turn."
Turn to Frog70%
$0.18↓#9066↓0.2915.3 years↑
"Until end of turn, target creature loses all abilities and becomes a blue Frog with base power and toughness 1/1."