Ritual of the Machine 
Sorcery
$9.02 #18193 0.53 30.2 years
As an additional cost to cast this spell, sacrifice a creature.
Gain control of target nonartifact, nonblack creature.
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Grafted Identity100%
$0.21↓#190420.36↓4.9 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Vicious Betrayal88%
$0.19↓#28772↓0.25↓22.3 years↓
"As an additional cost to cast this spell, sacrifice any number of creatures."
Bone Splinters85%
$0.03↓#5966↑0.5517.9 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Demon of Catastrophes83%
$0.31↓#151290.20↓8.1 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Tendrils of Despair83%
$0.16↓#26817↓0.6029.2 years
"As an additional cost to cast this spell, sacrifice a creature."
Sower of Temptation82%
$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."
Worthy Cost82%
$0.30↓#5698↑0.19↓1.4 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Launch Party82%
$0.09↓#26216↓0.06↓13.9 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Entrancing Melody82%
$0.24↓#11399↑0.69↑8.9 years↓
"Gain control of target creature with mana value X."
Call for Blood81%
$0.06↓#29047↓0.35↓21.6 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Tormented Thoughts80%
$0.08↓#23080↓0.6012.3 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Corrupted Conviction80%
$0.40↓#596↑0.10↓3.4 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Skulltap80%
$0.16↓#189670.5623.3 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Village Rites80%
$0.32↓#202↑0.09↓6.2 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Fiery Conclusion80%
$0.05↓#22932↓0.00↓20.9 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Wicked Reward80%
$0.12↓#29727↓0.25↓29.8 years
"As an additional cost to cast this spell, sacrifice a creature."
Severed Strands80%
$0.05↓#13041↑0.69↑7.9 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Altar's Reap80%
$0.18↓#4428↑0.23↓14.9 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Reckless Abandon78%
$0.12↓#22942↓0.05↓27.2 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Tend the Pests78%
$0.62↓#5253↑0.19↓5.4 years↓
"As an additional cost to cast this spell, sacrifice a creature."