Thundertrap Trainer 

Creature — Otter Wizard
$0.80 #5726 0.00 2.2 years
Offspring
(You may pay an additional
as you cast this spell. If you do, when this creature enters, create a 1/1 token copy of it.)
When this creature enters, look at the top four cards of your library. You may reveal a noncreature, nonland card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
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Cards similar to Thundertrap Trainer 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.
Wandering Mind94%
$0.12↓#20127↓0.004.9 years↑
"When this creature enters, look at the top six cards of your library. You may reveal a noncreature, nonland card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."
Search for Azcanta // Azcanta, the Sunken Ruin86%
$2.01↑#3986↑0.17↑9.1 years↑
"
,
: Look at the top four cards of your library. You may reveal a noncreature, nonland card from among them and put it into your hand. Put the rest on the bottom of your library in any order."
Narset, Parter of Veils86%
$0.95↑#982↑2.06↑7.5 years↑
"−2: Look at the top four cards of your library. You may reveal a noncreature, nonland card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."
Fallaji Archaeologist85%
$0.32↓#17760↓0.47↑3.9 years↑
"When this creature enters, mill three cards. You may put a noncreature, nonland card from among the cards milled this way into your hand. If you don't, put a +1/+1 counter on this creature."