Matter Reshaper {2}{C}
Creature — Eldrazi
({C} represents colorless mana.)
When this creature dies, reveal the top card of your library. You may put that card onto the battlefield if it's a permanent card with mana value 3 or less. Otherwise, put that card into your hand.
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Cards that do something similar 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.
Archghoul of Thraben 88%
$0.19#6076
"Whenever this creature or another Zombie you control dies, look at the top card of your library. If it's a Zombie card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard."
Rootless Yew 87%
$0.24#16179
"When this creature dies, search your library for a creature card with power or toughness 6 or greater, reveal it, put it into your hand, then shuffle."
Fell Horseman // Deathly Ride 86%
$0.17#15384
"When this creature dies, put it on the bottom of its owner's library."
Murderous Rider // Swift End 86%
$0.35#1619
"When this creature dies, put it on the bottom of its owner's library."
Hoarding Recluse 84%
$0.18#15721
"When this creature dies, put up to one other target card from a graveyard on the bottom of its owner's library."
Welkin Hawk 84%
$0.11#31472
"When this creature dies, you may search your library for a card named this card, reveal that card, put it into your hand, then shuffle."
Wretched Throng 84%
$0.05#28987
"When this creature dies, you may search your library for a card named this card, reveal it, put it into your hand, then shuffle."
Arashin Sovereign 82%
$0.20#23224
"When this creature dies, you may put it on your choice of the top or bottom of its owner's library."
Lost Auramancers 82%
$0.22#16428
"When this creature dies, if it had no time counters on it, you may search your library for an enchantment card, put it onto the battlefield, then shuffle."
Treasure Keeper 82%
$0.17#10562
"When this creature dies, reveal cards from the top of your library until you reveal a nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order."
Sadistic Augermage 81%
$0.14#29650
"When this creature dies, each player puts a card from their hand on top of their library."
Draconic Muralists 81%
$0.27#7232
"When this creature dies, you may search your library for a Dragon card, reveal it, put it into your hand, then shuffle."
Aphetto Vulture 81%
$0.19#28126
"When this creature dies, you may put target Zombie card from your graveyard on top of your library."