Dual Nature 
Enchantment
$2.62 #19659 0.86 26.3 years
Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature.
Whenever a nontoken creature leaves the battlefield, exile all tokens with the same name as that creature.
When this enchantment leaves the battlefield, exile all tokens created with this enchantment.
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Cards similar to Dual Nature expected a card that isn't here?
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Bramble Sovereign94%
$3.90↑#4769↑0.23↓8.2 years↓
"Whenever another nontoken creature enters, you may pay 
. If you do, that creature's controller creates a token that's a copy of that creature."
. If you do, that creature's controller creates a token that's a copy of that creature."
Dance of Many90%
$0.49↓#162220.00↓32.1 years↑
"When this enchantment leaves the battlefield, exile the token."
+1 more matching line
Theoretical Duplication83%
$0.72↓#6349↑0.28↓5.4 years↓
"Whenever a nontoken creature an opponent controls enters this turn, create a token that's a copy of that creature."
Arcane Artisan83%
$0.31↓#189610.00↓8.2 years↓
"When this creature leaves the battlefield, exile all tokens created with it at the beginning of the next end step."
Shaun, Father of Synths83%
$0.32↓#6705↑0.45↓2.5 years↓
"When this card leaves the battlefield, exile all Synth tokens you control."
Minion Reflector83%
$1.77↓#14846↑0.33↓17.9 years↓
"Whenever a nontoken creature you control enters, you may pay 
. If you do, create a token that's a copy of that creature, except it has haste and "At the beginning of the end step, sacrifice this permanent.""
. If you do, create a token that's a copy of that creature, except it has haste and "At the beginning of the end step, sacrifice this permanent.""
Faerie Artisans82%
$2.03↓#4857↑0.33↓9.8 years↓
"Whenever a nontoken creature an opponent controls enters, create a token that's a copy of that creature except it's an artifact in addition to its other types. Then exile all other tokens created with this creature."
Severance Priest79%
$0.08↓#24071↓0.29↓1.4 years↓
"When this creature leaves the battlefield, the exiled card's owner creates an X/X white Spirit creature token, where X is the mana value of the exiled card."
Flameshadow Conjuring79%
$3.00↑#3029↑0.37↓11.1 years↓
"Whenever a nontoken creature you control enters, you may pay 
. If you do, create a token that's a copy of that creature. That token gains haste. Exile it at the beginning of the next end step."
. If you do, create a token that's a copy of that creature. That token gains haste. Exile it at the beginning of the next end step."
Necroduality78%
$6.15↑#3040↑0.62↓4.8 years↓
"Whenever a nontoken Zombie you control enters, create a token that's a copy of that creature."
Skyclave Apparition77%
$0.26↓#1219↑0.39↓5.9 years↓
"When this creature leaves the battlefield, the exiled card's owner creates an X/X blue Illusion creature token, where X is the mana value of the exiled card."
Riku of Two Reflections76%
$5.72↑#12137↑0.47↓15.2 years↓
"Whenever another nontoken creature you control enters, you may pay 
. If you do, create a token that's a copy of that creature."
. If you do, create a token that's a copy of that creature."
Genesis Chamber76%
$3.82↑#2820↑0.27↓22.6 years↓
"Whenever a nontoken creature enters, if this artifact is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token."
Molten Echoes75%
$9.09↑#2424↑0.29↓6.4 years↓
"Whenever a nontoken creature you control of the chosen type enters, create a token that's a copy of that creature. That token gains haste. Exile it at the beginning of the next end step."
Followed Footsteps74%
$3.26↑#9065↑0.38↓20.9 years↓
"At the beginning of your upkeep, create a token that's a copy of enchanted creature."
Octomancer74%
$0.34↓#4465↑0.43↓2.1 years↓
"At the beginning of each end step, create a token that's a copy of target creature token that entered the battlefield this turn."
Thragtusk74%
$0.26↓#8212↑0.05↓14.1 years↓
"When this creature leaves the battlefield, create a 3/3 green Beast creature token."
Walker of the Grove74%
$0.05↓#216220.00↓18.6 years↓
"When this creature leaves the battlefield, create a 4/4 green Elemental creature token."
Tombstone Stairwell74%
$61.08↑#9581↑0.62↓29.9 years↑
"At the beginning of each end step and when this enchantment leaves the battlefield, destroy all tokens created with this enchantment. They can't be regenerated."
+1 more matching line
Featherbrained Filcher74%
$0.17↓#215190.00↓0.5 years↓
"When this creature leaves the battlefield, create a Food token."