Theoretical Duplication 
Instant
$0.59 #6541 0.06 5.5 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%
$1.81↑#4899↑0.58↑9.9 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%
$3.17↑#3082↑0.20↑11.3 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%
$2.69↑#20065↓0.35↑26.4 years↑
"Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature."
Bramble Sovereign82%
$1.05↑#4696↑0.58↑8.4 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%
$1.67↑#15111↓0.0518.0 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%
$8.79↑#2474↑0.39↑6.5 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%
$6.04↑#3040↑0.48↑4.9 years
"Whenever a nontoken Zombie you control enters, create a token that's a copy of that creature."
Riku of Two Reflections76%
$5.55↑#12385↓0.26↑15.3 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%
$1.87↑#4183↑0.27↑7.7 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."
Preston, the Vanisher73%
$54.23↑#3839↑0.81↑3.9 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."
Unstable Shapeshifter72%
$1.16↑#25825↓0.18↑29.0 years↑
"Whenever another creature enters, this creature becomes a copy of that creature, except it has this ability."
Followed Footsteps72%
$2.63↑#9256↓0.1221.0 years↑
"At the beginning of your upkeep, create a token that's a copy of enchanted creature."
Renegade Doppelganger72%
$0.55↓#19320↓0.1116.5 years↑
"Whenever another creature you control enters, you may have this creature become a copy of that creature until end of turn."
Dance of Many70%
$0.48↓#16587↓0.0032.2 years↑
"When this enchantment enters, create a token that's a copy of target nontoken creature."
Aboleth Spawn70%
$7.03↑#3915↑0.42↑4.4 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."
Twilight Diviner70%
$2.03↑#2809↑0.34↑0.7 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."