Theoretical Duplication 
Instant
$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.
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Faerie Artisans93%
$2.03↑#4857↑0.339.8 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."
Flameshadow Conjuring84%
$3.00↑#3029↑0.3711.1 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."
Dual Nature83%
$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."
Bramble Sovereign82%
$3.90↑#4769↑0.238.2 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."
Minion Reflector82%
$1.77↑#14846↓0.3317.9 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.""
Molten Echoes80%
$9.09↑#2424↑0.296.4 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."
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."
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."
Mirror March76%
$2.13↑#4111↑0.42↑7.6 years↑
"Whenever a nontoken creature you control enters, flip a coin until you lose a flip. For each flip you won, create a token that's a copy of that creature. Those tokens gain haste. Exile them at the beginning of the next end step."
Renegade Doppelganger75%
$0.49↓#19345↓0.2416.4 years↑
"Whenever another creature you control enters, you may have this creature become a copy of that creature until end of turn."
Unstable Shapeshifter74%
$1.00↑#25569↓0.53↑28.9 years↑
"Whenever another creature enters, this creature becomes a copy of that creature, except it has this ability."
Preston, the Vanisher73%
$34.06↑#3901↑0.363.8 years↓
"Whenever another nontoken creature you control enters, if it wasn't cast, create a token that's a copy of that creature, except it's a 0/1 white Illusion."
Aboleth Spawn72%
$7.09↑#3909↑0.344.2 years↓
"Whenever a creature entering under an opponent's control causes a triggered ability of that creature to trigger, you may copy that ability. You may choose new targets for the copy."
Followed Footsteps72%
$3.26↑#9065↓0.3820.9 years↑
"At the beginning of your upkeep, create a token that's a copy of enchanted creature."
Dance of Many70%
$0.49↓#16222↓0.00↓32.1 years↑
"When this enchantment enters, create a token that's a copy of target nontoken creature."
Twilight Diviner70%
$1.97↑#3149↑0.00↓0.6 years↓
"Whenever one or more other creatures you control enter, if they entered or were cast from a graveyard, create a token that's a copy of one of them. This ability triggers only once each turn."