Opalescence 
Enchantment
$37.49 #13139 0.69 27.2 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%
$14.24↓#2225↑0.52↓11.1 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%
$0.53↓#144240.24↓22.9 years↓
"Each noncreature artifact is an artifact creature with power and toughness each equal to its mana value."
Zur, Eternal Schemer73%
$2.19↓#3912↑0.614.0 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%
$0.33↓#6582↑0.55↓2.2 years↓
"Other creatures have base power and toughness 2/2 and are Bears in addition to their other types."
Living Plane70%
$210.29↑#17827↓0.97↑32.3 years↑
"All lands are 1/1 creatures that are still lands."