Shield Sphere 
Artifact Creature — Wall
$10.28 #4070 0.18 30.2 years
Defender
Whenever this creature blocks, put a -0/-1 counter on it.
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Cards similar to Shield Sphere 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.
Necropolis95%
$2.16↓#24344↓0.2732.1 years↑
"Defender"
Wall of Shields92%
$0.34↓#23651↓0.59↑31.3 years↑
"Defender"
Wall of Spears92%
$0.11↓#23554↓0.2432.5 years↑
"Defender"
Living Wall88%
$0.32↓#19743↓0.00↓33.1 years↑
"Defender"
Wall of Resistance87%
$0.23↓#21686↓0.1929.9 years
"Defender"
Wall of Roots86%
$0.19↓#35980.1629.9 years
"Defender"
Shifting Wall85%
$0.35↓#12700↓0.38↑28.5 years↓
"Defender"
Walking Wall84%
$0.19↓#25477↓0.2431.3 years↑
"Defender"
Goblin Elite Infantry82%
$0.06↓#30198↓0.53↑29.9 years
"Whenever this creature blocks or becomes blocked, it gets -1/-1 until end of turn."
Mobile Fort82%
$0.32↓#25400↓0.2427.9 years↓
"Defender"
Stoic Ephemera81%
$0.12↓#27806↓0.2220.3 years↓
"Defender"
Snow Fortress80%
$0.59↓#26005↓0.07↓31.3 years↑
"Defender"
Jungle Wurm78%
$0.10↓#31261↓0.40↑29.9 years
"Whenever this creature becomes blocked, it gets -1/-1 until end of turn for each creature blocking it beyond the first."
Johtull Wurm78%
$0.22↓#31364↓0.36↑31.3 years↑
"Whenever this creature becomes blocked, it gets -2/-1 until end of turn for each creature blocking it beyond the first."
Slinking Giant77%
$0.10↓#30829↓0.2218.3 years↓
"Whenever this creature blocks or becomes blocked, it gets -3/-0 until end of turn."
Wall of Dust76%
$0.21↓#25736↓0.00↓32.3 years↑
"Defender"
Blistering Barrier76%
$0.12↓#28229↓0.36↑29.9 years
"Defender"
Wall of Ice76%
$0.31↓#17029↓0.00↓33.1 years↑
"Defender"
Custodian of the Trove76%
$0.04↓#27532↓0.00↓11.4 years↓
"Defender"
Archers of Qarsi76%
$0.05↓#25489↓0.2211.6 years↓
"Defender"