Opalescence 
Enchantment
$34.57 #13505 0.29 27.4 years
Each other non-Aura enchantment is a creature in addition to its other types and has base power and base toughness each equal to its mana value.
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Cards similar to Opalescence 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.
Starfield of Nyx88%
$7.04↓#2339↑0.48↑11.3 years↓
"As long as you control five or more enchantments, each other non-Aura enchantment you control is a creature in addition to its other types and has base power and base toughness each equal to its mana value."
March of the Machines74%
$0.52↓#145940.3323.0 years↓
"Each noncreature artifact is an artifact creature with power and toughness each equal to its mana value."
Zur, Eternal Schemer72%
$1.91↓#4168↑0.69↑4.1 years↓
"
: Target non-Aura enchantment you control becomes a creature in addition to its other types and has base power and base toughness each equal to its mana value."
: Target non-Aura enchantment you control becomes a creature in addition to its other types and has base power and base toughness each equal to its mana value."
Kudo, King Among Bears70%
$0.36↓#6663↑0.47↑2.3 years↓
"Other creatures have base power and toughness 2/2 and are Bears in addition to their other types."
Living Plane70%
$208.78↑#18175↓1.03↑32.4 years↑
"All lands are 1/1 creatures that are still lands."