Megatherium 
Creature — Beast
$0.42 #31877 0.24 26.9 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%
$0.39↓#318050.2926.9 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."
Dread Slag82%
$0.36↓#309490.2720.3 years↓
"This creature gets -4/-4 for each card in your hand."
+1 more matching line
Grim Strider82%
$0.07↓#293810.35↑9.4 years↓
"This creature gets -1/-1 for each card in your hand."
Iwamori of the Open Fist80%
$0.09↓#23664↑0.2421.6 years↓
"Trample"
Taniwha76%
$5.80↑#14411↑0.2929.9 years↑
"Trample"
Stingerback Terror75%
$0.26↓#17532↑0.222.4 years↓
"This creature gets -1/-1 for each card in your hand."
Ivory Tower75%
$0.20↓#5824↑0.36↑32.5 years↑
"At the beginning of your upkeep, you gain X life, where X is the number of cards in your hand minus 4."
Ball Lightning75%
$0.36↓#8725↑0.06↓32.1 years↑
"Trample"
Bulwark74%
$0.43↑#260730.57↑27.9 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."
Clockwork Vorrac72%
$0.12↓#24989↑0.00↓22.9 years↓
"Trample"
Arctic Nishoba72%
$0.20↓#300400.52↑21.0 years↓
"Trample"
Cosmic Larva72%
$0.36↓#19553↑0.2922.3 years↓
"Trample"
Geralf's Masterpiece72%
$0.34↓#23770↑0.43↑10.4 years↓
"This creature gets -1/-1 for each card in your hand."
Crumbling Colossus72%
$0.05↓#23785↑0.00↓15.1 years↓
"Trample"
Runaway Carriage70%
$0.06↓#283120.2110.4 years↓
"Trample"
Keldon Battlewagon70%
$0.20↓#281940.00↓26.3 years
"Trample"
Shah of Naar Isle70%
$0.33↓#23404↑0.00↓19.3 years↓
"Trample"
Endless Wurm70%
$0.26↓#272920.43↑27.9 years
"Trample"
Stampeding Wildebeests70%
$0.12↓#24525↑0.2429.6 years↑
"Trample"
The Balrog, Flame of Udûn70%
$0.29↓#21198↑0.183.2 years↓
"Trample"