Trade the Helm 
Sorcery
$0.18 #16166 0.51 1.6 years
Exchange control of target artifact or creature you control and target artifact or creature an opponent controls.
Cycling 
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Shrewd Negotiation98%
$0.09↓#24831↓0.509.9 years↑
"Exchange control of target artifact you control and target artifact or creature you don't control."
Legerdemain94%
$0.21↑#153640.40↓28.9 years↑
"Exchange control of target artifact or creature and another target permanent that shares one of those types with it."
Switcheroo91%
$0.16↓#142820.64↑14.1 years↑
"Exchange control of two target creatures."
Shifting Grift88%
$0.29↑#6426↑0.40↓2.4 years
"+ 
— Exchange control of two target artifacts."
— Exchange control of two target artifacts."
Juxtapose88%
$0.32↑#24349↓0.6132.3 years↑
"You and target player exchange control of the creature you each control with the greatest mana value. Then exchange control of artifacts the same way. If two or more permanents a player controls are tied for greatest, their controller chooses one of them."
Cultural Exchange86%
$4.56↑#12609↑0.63↑24.9 years↑
"Choose any number of creatures target player controls. Choose the same number of creatures another target player controls. Those players exchange control of those creatures."
Modify Memory86%
$0.16↓#7920↑0.22↓4.2 years↑
"Exchange control of two target creatures controlled by different players. If you control neither creature, draw three cards."
Chromeshell Crab84%
$0.28↑#9481↑0.06↓23.6 years↑
"When this creature is turned face up, you may exchange control of target creature you control and target creature an opponent controls."
Yoked Plowbeast84%
$0.10↓#25987↓0.4717.9 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Wasteland Scorpion84%
$0.03↓#21935↓0.00↓9.4 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Lava Serpent84%
$0.15↓#22043↓0.07↓6.4 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Rampaging Hippo84%
$0.07↓#22483↓0.17↓9.1 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Jungle Weaver84%
$0.11↓#22010↓0.4717.9 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Sandbar Serpent84%
$0.21↑#29462↓0.5727.9 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Ridge Rannet84%
$0.04↓#26494↓0.27↓17.9 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Barkhide Mauler84%
$0.11↓#28745↓0.20↓23.9 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Imposing Vantasaur84%
$0.14↓#151590.00↓6.4 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Pendrell Drake83%
$0.07↓#28985↓0.00↓27.9 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Angel of the God-Pharaoh83%
$0.20↑#21923↓0.00↓9.1 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Granitic Titan83%
$0.18#23621↓0.20↓9.1 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."