Mirrormind Crown 
Artifact — Equipment
As long as this Equipment is attached to a creature, the first time you would create one or more tokens each turn, you may instead create that many tokens that are copies of equipped creature.
Equip {2}
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Cards that do something similar expected a card that isn't here?
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Assimilation Aegis 89%
$0.41#9897
"Whenever this Equipment becomes attached to a creature, for as long as this Equipment remains attached to it, that creature becomes a copy of a creature card exiled with this Equipment."
+1 more matching line
Illusionist's Bracers 88%
$5.85#1592
"Whenever an ability of equipped creature is activated, if it isn't a mana ability, copy that ability. You may choose new targets for the copy."
+1 more matching line
Bloodforged Battle-Axe 88%
$2.36#1697
"Whenever equipped creature deals combat damage to a player, create a token that's a copy of this Equipment."
+1 more matching line
Blade of Shared Souls 88%
$0.32#12065
"Whenever this Equipment becomes attached to a creature, for as long as this Equipment remains attached to it, you may have that creature become a copy of another target creature you control."
+1 more matching line
Conqueror's Flail 87%
$3.85#1403
"As long as this Equipment is attached to a creature, your opponents can't cast spells during your turn."
+1 more matching line
Battlemage's Bracers 87%
$3.59#5374
"Whenever an ability of equipped creature is activated, if it isn't a mana ability, you may pay {1}. If you do, copy that ability. You may choose new targets for the copy."
+1 more matching line
Pariah's Shield 84%
$5.49#4487
"All damage that would be dealt to you is dealt to equipped creature instead."
+1 more matching line
Paleontologist's Pick-Axe // Dinosaur Headdress 83%
$0.54#17654
"Equipped creature is a copy of the last chosen card."
+1 more matching line
Inquisitor's Flail 82%
$1.39#4198
"If another creature would deal combat damage to equipped creature, it deals double that damage to equipped creature instead."
+1 more matching line
O-Naginata 82%
$0.50#7140
"This Equipment can be attached only to a creature with power 3 or greater."
+1 more matching line
Dowsing Dagger // Lost Vale 82%
$6.82#2347
"Whenever equipped creature deals combat damage to a player, you may transform this Equipment."
+1 more matching line