Favorable Destiny 

Enchantment — Aura
Enchant creature
Enchanted creature gets +1/+2 as long as it's white.
Enchanted creature has shroud as long as its controller controls another creature. (It can't be the target of spells or abilities.)
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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.
Serra's Boon 94%
$0.19#29176
"Enchanted creature gets +1/+2 as long as it's white. Otherwise, it gets -2/-1."
+1 more matching line
Edge of the Divinity 86%
$0.38#13483
"As long as enchanted creature is white, it gets +1/+2."
+1 more matching line