Thelon's Chant {1}{G}{G}
Enchantment
At the beginning of your upkeep, sacrifice this enchantment unless you pay {G}.
Whenever a player puts a Swamp onto the battlefield, this enchantment deals 3 damage to that player unless the player puts a -1/-1 counter on a creature they control.
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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.
Nature's Wrath 100%
#23372
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {G}."
Solitary Confinement 83%
$0.49#4060
"At the beginning of your upkeep, sacrifice this enchantment unless you discard a card."