Chromium, the Mutable 
Legendary Creature — Elder Dragon
$0.78 #17158 0.05 8.3 years
Flash
This spell can't be countered.
Flying
Discard a card: Until end of turn, Chromium becomes a Human with base power and toughness 1/1, loses all abilities, and gains hexproof. It can't be blocked this turn.
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Cards similar to Chromium, the Mutable 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.
Oona's Prowler87%
$0.25↓#21324↓0.0019.0 years↑
"Flying"
Hit-Monkey82%
$2.68↑#12010↑0.58↑0.3 years↓
"This spell can't be countered."
Terra Stomper82%
$0.17↓#156870.0617.0 years↑
"This spell can't be countered."
Vexing Beetle82%
$0.26↓#31784↓0.0023.7 years↑
"This spell can't be countered."
Gigantic Big Bear82%
$0.45↓#10399↑0.24↑0.2 years↓
"This spell can't be countered."
Blurred Mongoose82%
$0.59↓#30655↓0.0026.0 years↑
"This spell can't be countered."
Carnage Tyrant82%
$0.53↓#6466↑0.18↑9.1 years
"This spell can't be countered."
Cephalid Inkshrouder79%
$0.37↓#158170.27↑24.4 years↑
"Discard a card: This creature gains shroud until end of turn and can't be blocked this turn."
Malfegor79%
$0.47↓#147370.56↑17.7 years↑
"Flying"
Last Word78%
$0.66↓#187100.35↑22.7 years↑
"This spell can't be countered."
Cragplate Baloth78%
$0.23↓#13017↑0.006.1 years↓
"This spell can't be countered."
Scragnoth78%
$0.12↓#31168↓0.27↑29.0 years↑
"This spell can't be countered."
Skylasher78%
$0.19↓#181850.0613.5 years↑
"This spell can't be countered."
Petrified Wood-Kin78%
$0.27↓#28305↓0.26↑20.7 years↑
"This spell can't be countered."
Mistcutter Hydra78%
$2.86↑#5016↑0.24↑13.1 years↑
"This spell can't be countered."
Loxodon Smiter78%
$0.26↓#23471↓0.0614.0 years↑
"This spell can't be countered."
Heated Debate78%
$0.14↓#205210.065.5 years↓
"This spell can't be countered."
Slice from the Shadows77%
$0.17↓#8560↑0.40↑2.7 years↓
"This spell can't be countered."
Kavu Chameleon76%
$0.17↓#30296↓0.0026.0 years↑
"This spell can't be countered."
Supreme Verdict76%
$1.59↑#470↑0.86↑14.0 years↑
"This spell can't be countered."