Megatherium 
Creature — Beast
$0.42 #32165 0.22 27.0 years
Trample
When this creature enters, sacrifice it unless you pay 
for each card in your hand.
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Cards similar to Megatherium 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.
Extravagant Spirit91%
$0.30↓#321110.11↓27.0 years
"At the beginning of your upkeep, sacrifice this creature unless you pay for each card in your hand."
for each card in your hand."
Sulam Djinn88%
$0.23↓#320600.00↓26.0 years
"Trample"
Dread Slag82%
$0.36↓#313280.2420.5 years↓
"This creature gets -4/-4 for each card in your hand."
Grim Strider82%
$0.10↓#297880.00↓9.5 years↓
"This creature gets -1/-1 for each card in your hand."
Iwamori of the Open Fist80%
$0.10↓#23961↑0.00↓21.7 years↓
"Trample"
Phyrexian Dreadnought78%
$271.37↑#9550↑0.32↑30.0 years↑
"Trample"
Aku Djinn78%
$0.74↑#261660.10↓29.7 years↑
"Trample"
Earthen Goo78%
$0.21↓#318860.07↓20.2 years↓
"Trample"
Taniwha76%
$5.58↑#14636↑0.39↑30.0 years↑
"Trample"
Ivory Tower75%
$0.20↓#5746↑0.00↓32.6 years↑
"At the beginning of your upkeep, you gain X life, where X is the number of cards in your hand minus 4."
Bulwark74%
$0.43↑#264890.33↑28.0 years
"At the beginning of your upkeep, this enchantment deals X damage to target opponent, where X is the number of cards in your hand minus the number of cards in that player's hand."
Stingerback Terror74%
$0.27↓#17936↑0.00↓2.5 years↓
"This creature gets -1/-1 for each card in your hand."
Ludevic's Test Subject // Ludevic's Abomination73%
$0.29↓#19084↑0.12↓15.1 years↓
"Trample"
Clockwork Vorrac72%
$0.11↓#25338↑0.3123.0 years↓
"Trample"
Cosmic Larva72%
$0.38↓#19799↑0.12↓22.4 years↓
"Trample"
Arctic Nishoba72%
$0.21↓#303170.00↓21.2 years↓
"Trample"
Geralf's Masterpiece72%
$0.31↓#24068↑0.12↓10.5 years↓
"This creature gets -1/-1 for each card in your hand."
Crumbling Colossus72%
$0.05↓#23995↑0.2215.3 years↓
"Trample"
Polar Kraken72%
$3.66↑#258950.06↓31.4 years↑
"Trample"
Cactuar70%
$0.22↓#17762↑0.291.4 years↓
"Trample"