Chainer, Nightmare Adept 
Legendary Creature — Human Minion
$0.77 #1603 0.28 7.0 years
Discard a card: You may cast a creature spell from your graveyard this turn. Activate only once each turn.
Whenever a nontoken creature you control enters, if you didn't cast it from your hand, it gains haste until your next turn.
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Cards similar to Chainer, Nightmare Adept 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.
Alex Wilder, Runaway81%
$0.32↓#22172↓0.00↓0.2 years↓
"Whenever this card or another creature you control enters, if you cast it from anywhere other than your hand, it gets +2/+0 and gains haste until end of turn."
Kotis, Sibsig Champion79%
$0.34↓#7346↓0.261.4 years↓
"Once during each of your turns, you may cast a creature spell from your graveyard by exiling three other cards from your graveyard in addition to paying its other costs."
Case of the Uneaten Feast70%
$0.32↓#5685↓0.07↓2.6 years↓
"Whenever a creature you control enters, you gain 1 life."
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