Dack's Duplicate 
Creature — Shapeshifter
$0.27 #11159 0.07 12.2 years
You may have this creature enter as a copy of any creature on the battlefield, except it has haste and dethrone. (Whenever it attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)
Click a line or tag to filter
Cards similar to Dack's Duplicate 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.
Stunt Double78%
$4.07↑#3805↑0.22↑10.0 years↓
"You may have this creature enter as a copy of any creature on the battlefield."
Clone78%
$0.31↑#3742↑0.31↑33.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Copycrook76%
$0.27#6076↑0.27↑2.2 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it has "Whenever this creature attacks, it connives.""
Mirror Image76%
$0.30↑#5382↑0.19↑8.1 years↓
"You may have this creature enter as a copy of a creature you control."
Protean Raider74%
$0.68↑#13446↓0.67↑8.6 years↓
"If you attacked this turn, you may have this creature enter as a copy of any creature on the battlefield."
Quicksilver Gargantuan72%
$0.54↑#18240↓0.1415.9 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Glasspool Mimic // Glasspool Shore70%
$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."
Progenitor Mimic70%
$1.11↑#5370↑0.43↑13.3 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has "At the beginning of your upkeep, if this creature isn't a token, create a token that's a copy of this creature.""
Altered Ego70%
$0.20↓#4080↑0.1310.4 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."