Mockingbird 
Creature — Bird Bard
$4.16 #733 0.36 2.1 years
Flying
You may have this creature enter as a copy of any creature on the battlefield with mana value less than or equal to the amount of mana spent to cast this creature, except it's a Bird in addition to its other types and it has flying.
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Cards similar to Mockingbird expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Malleable Impostor84%
$5.78↑#4494↓0.16↓3.0 years
"You may have this creature enter as a copy of a creature an opponent controls, except it's a Faerie Shapeshifter in addition to its other types and it has flying."
Stunt Double79%
$4.07↓#3805↓0.22↓10.0 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Clone79%
$0.31↓#3742↓0.3133.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Mirror Image78%
$0.30↓#5382↓0.19↓8.1 years↑
"You may have this creature enter as a copy of a creature you control."
Quicksilver Gargantuan76%
$0.54↓#18240↓0.14↓15.9 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Glasspool Mimic // Glasspool Shore75%
$5.87↑#1166↓0.21↓5.9 years↑
"You may have this creature enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types."
Deceptive Frostkite74%
$1.30↓#3790↓0.25↓1.4 years
"You may have this creature enter as a copy of a creature you control with power 4 or greater, except it's a Dragon in addition to its other types and it has flying."
+1 more matching line
Visage Bandit74%
$0.15↓#7365↓0.412.4 years
"You may have this creature enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types."
Mistform Dreamer74%
$0.09↓#30984↓0.06↓23.9 years↑
"Flying"
Mirrorhall Mimic // Ghastly Mimicry73%
$2.02↓#4095↓0.17↓4.8 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Spirit in addition to its other types."
Synth Infiltrator72%
$0.27↓#8898↓0.432.5 years
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Synth artifact creature in addition to its other types."
Altered Ego72%
$0.20↓#4080↓0.13↓10.4 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it enters with X additional +1/+1 counters on it."
Vesuvan Doppelganger72%
$18.79↑#17248↓0.3533.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it doesn't copy that creature's color and it has "At the beginning of your upkeep, you may have this creature become a copy of target creature, except it doesn't copy that creature's color and it has this ability.""
Copy Enchantment72%
$1.77↓#2091↓0.2920.9 years↑
"You may have this enchantment enter as a copy of any enchantment on the battlefield."
Flesh Duplicate71%
$8.83↑#2745↓0.48↑2.9 years
"You may have this creature enter as a copy of any creature on the battlefield, except it has vanishing 3 if that creature doesn't have vanishing."
Gigantoplasm71%
$0.49↓#9188↓0.05↓10.8 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has ": This creature has base power and toughness X/X.""
: This creature has base power and toughness X/X.""
Archdemon of Paliano70%
$0.26↓#30350↓0.2710.0 years↑
"Flying"
Susurian Dirgecraft70%
$0.16↓#15335↓0.19↓1.1 years
"Flying"
Phantasmal Image70%
$4.89↑#1481↓0.3015.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's an Illusion in addition to its other types and it has "When this creature becomes the target of a spell or ability, sacrifice it.""
Sakashima's Student70%
$18.95↑#3645↓0.51↑14.3 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Ninja in addition to its other creature types."