Lithophage {3}{R}{R}
Creature — Insect
At the beginning of your upkeep, sacrifice this creature unless you sacrifice a Mountain.
click a line to search just that ability, click more to combine them
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.
Razormane Masticore 86%
$0.21#26753
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Molten-Tail Masticore 86%
$0.39#29145
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Masticore 86%
#24663
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Circling Vultures 84%
$0.29#25437
"At the beginning of your upkeep, sacrifice this creature unless you exile the top creature card of your graveyard."
Barrow Ghoul 84%
$0.21#27927
"At the beginning of your upkeep, sacrifice this creature unless you exile the top creature card of your graveyard."
Reclusive Wight 83%
$0.20#31015
"At the beginning of your upkeep, if you control another nonland permanent, sacrifice this creature."
Demonic Taskmaster 82%
$0.25#9488
"At the beginning of your upkeep, sacrifice a creature other than this creature."
Argentum Masticore 82%
$0.30#9838
"At the beginning of your upkeep, sacrifice this creature unless you discard a card. When you discard a card this way, destroy target nonland permanent an opponent controls with mana value less than or equal to the mana value of the discarded card."
Anurid Scavenger 82%
$0.24#23124
"At the beginning of your upkeep, sacrifice this creature unless you put a card from your graveyard on the bottom of your library."