Phyrexian Altar 
Artifact
$54.22 #307 1.32 26.0 years
Sacrifice a creature: Add one mana of any color.
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Cards similar to Phyrexian Altar 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.
Ashnod's Altar92%
$14.33↓#134↑1.13↓32.6 years↑
"Sacrifice a creature: Add 
."
."
Thermopod81%
$0.26↓#10279↓0.44↓20.2 years↓
"Sacrifice a creature: Add 
."
."
Krark-Clan Ironworks80%
$12.29↓#1319↓1.16↓22.4 years↓
"Sacrifice an artifact: Add ."
."
Squandered Resources78%
$84.42↑#5403↓0.60↓29.7 years↑
"Sacrifice a land: Add one mana of any type the sacrificed land could produce."
Utopia Mycon78%
$1.02↓#5152↓0.16↓19.5 years↓
"Sacrifice a Saproling: Add one mana of any color."
Phyrexian Tower78%
$30.75↓#194↑0.66↓28.0 years↑
"
, Sacrifice a creature: Add 
."
, Sacrifice a creature: Add ."
Transmogrant Altar77%
$0.15↓#10901↓0.00↓3.9 years↓
", , Sacrifice a creature: Add ."
, , Sacrifice a creature: Add ."
Firemind Vessel75%
$0.22↓#4258↓0.00↓7.5 years↓
": Add two mana of different colors."
: Add two mana of different colors."
The Golden Throne74%
$9.57↓#4498↓0.27↓4.0 years↓
", Sacrifice a creature: Add three mana in any combination of colors."
, Sacrifice a creature: Add three mana in any combination of colors."
Manalith74%
$0.19↓#7225↓0.00↓15.3 years↓
": Add one mana of any color."
: Add one mana of any color."
Sol Grail72%
$0.28↓#24944↓0.24↓30.4 years↑
": Add one mana of the chosen color."
: Add one mana of the chosen color."
Gilded Lotus71%
$0.68↓#412↓0.06↓23.0 years↓
": Add three mana of any one color."
: Add three mana of any one color."
Sceptre of Eternal Glory70%
$18.28↓#2379↓0.40↓4.0 years↓
": Add one mana of any color."
: Add one mana of any color."
Prismatic Lens70%
$0.27↓#1660↓0.00↓20.0 years↓
"
, : Add one mana of any color."
, : Add one mana of any color."
Bender's Waterskin70%
$0.80↓#535↓0.23↓0.9 years↓
": Add one mana of any color."
: Add one mana of any color."
Mana Prism70%
$0.22↓#25236↓0.00↓30.0 years↑
", : Add one mana of any color."
, : Add one mana of any color."