Chromium {2}{W}{W}{U}{U}{B}{B}
Legendary Creature — Elder Dragon
Flying
Rampage 2 (Whenever this creature becomes blocked, it gets +2/+2 until end of turn for each creature blocking it beyond the first.)
At the beginning of your upkeep, sacrifice Chromium unless you pay {W}{U}{B}.
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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.
Arcades Sabboth 93%
$0.22#23403
"At the beginning of your upkeep, sacrifice this card unless you pay {G}{W}{U}."
Piru, the Volatile 90%
$0.32#9671
"At the beginning of your upkeep, sacrifice this card unless you pay {R}{W}{B}."
Palladia-Mors 88%
#25103
"At the beginning of your upkeep, sacrifice this card unless you pay {R}{G}{W}."
Glaciers 86%
$0.53#29193
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{U}."
Nicol Bolas 84%
$1.43#12218
"At the beginning of your upkeep, sacrifice this card unless you pay {U}{B}{R}."
+1 more matching line
Mangara's Equity 82%
$0.19#30364
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {1}{W}."
Drought 81%
$0.32#27513
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}."
Justice 81%
$0.19#27313
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}."
Conversion 81%
#26418
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}."