Dune Chanter 

Creature — Plant Druid
$1.11 #6288 0.12 2.5 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%
$3.54↑#11867↓0.00↓22.4 years↑
"Lands you control have "
: Add one mana of any color.""
Mystic Skull // Mystic Monstrosity95%
$0.21↓#16867↓0.135.1 years↑
"Lands you control have "
: Add one mana of any color.""
Overlaid Terrain94%
$2.09↑#20792↓0.0626.7 years↑
"Lands you control have "
: Add two mana of any one color.""
+1 more matching line
Chromatic Lantern93%
$0.57↓#85↑0.2014.0 years↑
"Lands you control have "
: Add one mana of any color.""
Greenhouse // Rickety Gazebo92%
$0.19↓#70680.00↓2.1 years
"Lands you control have "
: Add one mana of any color.""
Divergent Growth90%
$0.13↓#26803↓0.0723.4 years↑
"Until end of turn, lands you control gain "
: Add one mana of any color.""
Tectonic Split87%
$2.36↑#7760↓0.22↑0.9 years↓
"Lands you control have "
: Add three mana of any one color.""
+1 more matching line
Toxicrene87%
$0.71↓#13867↓0.67↑4.0 years↑
"All lands have "
: Add one mana of any color" and lose all other abilities."
Cryptolith Rite85%
$9.49↑#662↑0.42↑10.5 years↑
"Creatures you control have "
: Add one mana of any color.""
Great Divide Guide85%
$1.05↓#2690↑0.160.9 years↓
"Each land and Ally you control has "
: Add one mana of any color.""
A Realm Reborn84%
$0.46↓#74350.76↑1.4 years↓
"Other permanents you control have "
: Add one mana of any color.""
Sheltered Aerie84%
$0.08↓#16977↓0.0611.6 years↑
"Enchanted land has "
: Add two mana of any one color.""
Gift of Paradise84%
$0.10↓#68710.00↓9.5 years↑
"Enchanted land has "
: Add two mana of any one color.""
Wrenn and Realmbreaker82%
$5.98↑#2697↑0.48↑3.5 years
"Lands you control have "
: Add one mana of any color.""
+2 more matching lines
The World Tree81%
$7.75↑#818↑0.41↑5.7 years↑
"As long as you control six or more lands, lands you control have "
: Add one mana of any color.""
Nature's Embrace81%
$0.21↓#14311↓0.00↓4.9 years↑
"As long as enchanted permanent is a land, it has "
: Add two mana of any one color.""