Nascent Metamorph 
Creature — Shapeshifter
$0.34 #17242 0.78 6.4 years
Whenever this creature attacks or blocks, target opponent reveals cards from the top of their library until they reveal a creature card. This creature becomes a copy of that card until end of turn. Then that player puts all cards revealed this way on the bottom of their library in a random order.
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Cards similar to Nascent Metamorph 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.
Tilonalli's Skinshifter77%
$0.22↓#23306↓0.50↓8.9 years↑
"Whenever this creature attacks, it becomes a copy of another target nonlegendary attacking creature until end of turn."
Elder Gargaroth75%
$1.71↑#2282↑0.28↓6.2 years
"Whenever this creature attacks or blocks, choose one —"
Freelance Muscle75%
$0.17↓#174960.22↓4.4 years↓
"Whenever this creature attacks or blocks, it gets +X/+X until end of turn, where X is the greatest power and/or toughness among other creatures you control."
Brimaz, King of Oreskos74%
$7.29↑#3035↑0.14↓12.6 years↑
"Whenever this card blocks a creature, create a 1/1 white Cat Soldier creature token with vigilance that's blocking that creature."
Jedit Ojanen of Efrava72%
$0.99↑#9500↑0.33↓21.0 years↑
"Whenever Jedit Ojanen attacks or blocks, create a 2/2 green Cat Warrior creature token with forestwalk."
Zhao Zilong, Tiger General72%
$112.79↑#26263↓0.41↓27.3 years↑
"Whenever this card blocks, it gets +1/+1 until end of turn."
Mana-Charged Dragon72%
$1.12↑#187720.6915.2 years↑
"Whenever this creature attacks or blocks, each player starting with you may pay any amount of mana. This creature gets +X/+0 until end of turn, where X is the total amount of mana paid this way."
Tenured Oilcaster70%
$0.13↓#23423↓0.60↓3.4 years↓
"Whenever this creature attacks or blocks, each player mills a card."
Merfolk Skyscout70%
$0.13↓#24013↓0.20↓16.4 years↑
"Whenever this creature attacks or blocks, untap target permanent."
Cleric of Chill Depths70%
$0.18↓#23365↓0.38↓5.9 years
"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
Labyrinth Minotaur70%
$0.11↓#30162↓0.14↓30.9 years↑
"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."