Trade the Helm 
Sorcery
$0.24 #16242 0.33 1.7 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%
$0.12↓#25169↓0.3810.1 years↑
"Exchange control of target artifact you control and target artifact or creature you don't control."
Legerdemain94%
$0.20↓#156251.00↑29.0 years↑
"Exchange control of target artifact or creature and another target permanent that shares one of those types with it."
Switcheroo91%
$0.14↓#144100.2414.3 years↑
"Exchange control of two target creatures."
Shifting Grift88%
$0.32↑#6539↑0.242.5 years
"+ 
— Exchange control of two target artifacts."
— Exchange control of two target artifacts."
Juxtapose88%
$0.32↑#24512↓0.71↑32.4 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%
$4.81↑#12621↑0.67↑25.1 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%
$0.20↓#8037↑0.404.4 years↑
"Exchange control of two target creatures controlled by different players. If you control neither creature, draw three cards."
The Trickster-God's Heist84%
$0.19↓#11791↑0.48↑5.7 years↑
"You may exchange control of two target creatures."
Jungle Weaver84%
$0.12↓#22448↓0.00↓18.0 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Ridge Rannet84%
$0.04↓#26841↓0.00↓18.0 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Wasteland Scorpion84%
$0.07↓#22291↓0.12↓9.5 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Yoked Plowbeast84%
$0.11↓#26442↓0.00↓18.0 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Lava Serpent84%
$0.15↓#22373↓0.00↓6.5 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Barkhide Mauler84%
$0.13↓#29153↓0.00↓24.0 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Sandbar Serpent84%
$0.26↑#29701↓0.00↓28.0 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Rampaging Hippo84%
$0.07↓#22992↓0.00↓9.3 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Imposing Vantasaur84%
$0.13↓#153790.06↓6.5 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Angel of the God-Pharaoh83%
$0.20↓#22214↓0.00↓9.3 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Shimmerscale Drake83%
$0.04↓#26499↓0.00↓9.5 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Pendrell Drake83%
$0.08↓#29329↓0.07↓28.0 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."