Tainted Well 

Enchantment — Aura
$0.12 #26153 0.19 26.0 years
Enchant land
When this Aura enters, draw a card.
Enchanted land is a Swamp.
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Cards similar to Tainted Well 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.
Spreading Seas95%
$0.18↑#12018↑0.31↑17.0 years↓
"Enchanted land is an Island."
+2 more matching lines
Lush Growth94%
$0.10↓#222400.00↓18.0 years↓
"Enchanted land is a Mountain, Forest, and Plains."
+1 more matching line
Lingering Mirage90%
$0.36↑#241080.33↑28.0 years↑
"Enchanted land is an Island."
+1 more matching line
Scourgemark90%
$0.08↓#18977↑0.00↓13.1 years↓
"When this Aura enters, draw a card."
+1 more matching line
Chosen by Heliod90%
$0.14↑#13787↑0.1713.1 years↓
"When this Aura enters, draw a card."
+1 more matching line