Jokulmorder 



Creature — Leviathan
$0.56 #24085 0.07 20.1 years
Trample
This creature enters tapped.
When this creature enters, sacrifice it unless you sacrifice five lands.
This creature doesn't untap during your untap step.
Whenever you play an Island, you may untap this creature.
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Cards similar to Jokulmorder 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.
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+1 more matching line
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"This creature doesn't untap during your untap step."
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Deep-Slumber Titan87%
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"This creature doesn't untap during your untap step."
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"This creature doesn't untap during your untap step."
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"This creature doesn't untap during your untap step."
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"This creature doesn't untap during your untap step."
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Phyrexian Colossus85%
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"This creature doesn't untap during your untap step."
Goblin Sharpshooter84%
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"This creature doesn't untap during your untap step."
Battered Golem82%
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"This creature doesn't untap during your untap step."
Scythe Tiger82%
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"When this creature enters, sacrifice it unless you sacrifice a land."
Farmstead Gleaner82%
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"This creature doesn't untap during your untap step."
Altar Golem82%
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"This creature doesn't untap during your untap step."
+1 more matching line
Leviathan82%
$0.29↓#254400.0632.1 years↑
"At the beginning of your upkeep, you may sacrifice two Islands. If you do, untap this creature."
+2 more matching lines
Grimgrin, Corpse-Born80%
$2.06↑#5872↑0.20↑14.9 years↓
"this card enters tapped and doesn't untap during your untap step."