Dune Chanter 

Creature — Plant Druid
$1.46 #6117 0.12 2.4 years
Reach
Lands you control and land cards you own that aren't on the battlefield are Deserts in addition to their other types.
Lands you control have "
: Add one mana of any color."
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Cards similar to Dune Chanter 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.
Joiner Adept96%
$3.72↑#11702↓0.29↑22.3 years↑
"Lands you control have "
: Add one mana of any color.""
Mystic Skull // Mystic Monstrosity95%
$0.15↓#16569↓0.074.9 years↑
"Lands you control have "
: Add one mana of any color.""
Overlaid Terrain94%
$2.01↑#20397↓0.0626.6 years↑
"Lands you control have "
: Add two mana of any one color.""
+1 more matching line
Chromatic Lantern92%
$0.98↓#85↑0.00↓13.9 years↑
"Lands you control have "
: Add one mana of any color.""
Divergent Growth90%
$0.12↓#26498↓0.00↓23.3 years↑
"Until end of turn, lands you control gain "
: Add one mana of any color.""
Greenhouse // Rickety Gazebo88%
$0.33↓#65900.131.9 years
"Lands you control have "
: Add one mana of any color.""
Tectonic Split88%
$1.95↑#7998↓0.00↓0.8 years↓
"Lands you control have "
: Add three mana of any one color.""
+1 more matching line
Toxicrene87%
$0.70↓#13534↓0.063.9 years↑
"All lands have "
: Add one mana of any color" and lose all other abilities."
Unbridled Growth86%
$0.24↓#12227↓0.47↑9.6 years↑
"Enchanted land has "
: Add one mana of any color.""
Cryptolith Rite85%
$7.59↑#690↑0.36↑10.4 years↑
"Creatures you control have "
: Add one mana of any color.""
Great Divide Guide85%
$1.02↓#2847↑0.00↓0.8 years↓
"Each land and Ally you control has "
: Add one mana of any color.""
A Realm Reborn84%
$0.41↓#7638↓0.43↑1.2 years↓
"Other permanents you control have "
: Add one mana of any color.""
Gift of Paradise84%
$0.11↓#67840.129.4 years↑
"Enchanted land has "
: Add two mana of any one color.""
Sheltered Aerie83%
$0.08↓#16695↓0.25↑11.4 years↑
"Enchanted land has "
: Add two mana of any one color.""
Wrenn and Realmbreaker82%
$5.52↑#2800↑0.38↑3.4 years
"Lands you control have "
: Add one mana of any color.""
+2 more matching lines
The World Tree81%
$7.08↑#815↑0.33↑5.6 years↑
"As long as you control six or more lands, lands you control have "
: Add one mana of any color.""
Nature's Embrace80%
$0.18↓#14037↓0.204.8 years↑
"As long as enchanted permanent is a land, it has "
: Add two mana of any one color.""