The Twelfth Doctor 
Legendary Creature — Time Lord Doctor
$0.32 #7345 0.44 2.9 years
The first spell you cast from anywhere other than your hand each turn has demonstrate. (When you cast that spell, you may copy it. If you do, choose an opponent to also copy it. A copy of a permanent spell becomes a token.)
Whenever you copy a spell, put a +1/+1 counter on The Twelfth Doctor.
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Cards similar to The Twelfth Doctor 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.
Silverquill Lecturer84%
$0.31↓#10557↓0.502.2 years
"Creature spells you cast have demonstrate."
Kalamax, the Stormsire76%
$0.67↑#9681↓0.516.4 years↑
"Whenever you copy an instant spell, put a +1/+1 counter on this card."
+1 more matching line
Mizzix, Replica Rider70%
$3.19↑#10353↓0.33↓3.8 years
"Whenever you cast a spell from anywhere other than your hand, you may pay 
. If you do, copy that spell and you may choose new targets for the copy. If the copy is a permanent spell, it gains haste and "At the beginning of your end step, sacrifice this permanent.""
. If you do, copy that spell and you may choose new targets for the copy. If the copy is a permanent spell, it gains haste and "At the beginning of your end step, sacrifice this permanent.""