Cephalid Coliseum
Land
{T}: Add {U}. This land deals 1 damage to you.
Threshold — {U}, {T}, Sacrifice this land: Target player draws three cards, then discards three cards. Activate only if there are seven or more cards in your graveyard.
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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.
Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time 100%
$3.72#3047
"{T}: Add {U}. Remove a time counter from this land."
+1 more matching line
Riverpyre Verge 100%
$19.24#944
"{T}: Add {U}. Activate only if you control an Island or a Mountain."
Hydraulic Helper 99%
$0.11#21816
"{T}: Add {U}. This mana can't be spent to cast a nonartifact spell."
Guidelight Optimizer 99%
$0.24#11123
"{T}: Add {U}. Spend this mana only to cast an artifact spell or activate an ability."
Hydro-Channeler 99%
$0.17#14708
"{T}: Add {U}. Spend this mana only to cast an instant or sorcery spell."
Lapis Orb of Dragonkind 99%
$0.21#6446
"{T}: Add {U}. When you spend this mana to cast a Dragon creature spell, scry 2."
Volshe Tideturner 99%
$0.20#14551
"{T}: Add {U}. Spend this mana only to cast an instant or sorcery spell or a kicked spell."
Unblinking Observer 99%
$0.16#18594
"{T}: Add {U}. Spend this mana only to pay a disturb cost or cast an instant or sorcery spell."