Shield Sphere 
Artifact Creature — Wall
$8.61 #4066 0.06 30.4 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%
$1.79↓#24402↓0.0032.2 years↑
"Defender"
Wall of Shields92%
$0.35↓#23819↓0.65↑31.4 years↑
"Defender"
Wall of Spears92%
$0.13↓#23588↓0.0032.6 years↑
"Defender"
Living Wall88%
$0.34↓#19838↓0.22↑33.2 years↑
"Defender"
Wall of Resistance87%
$0.23↓#21768↓0.18↑30.0 years
"Defender"
Wall of Roots86%
$0.19↓#36070.1430.0 years
"Defender"
Shifting Wall85%
$0.37↓#12876↓0.0028.6 years↓
"Defender"
Walking Wall84%
$0.20↓#25627↓0.0031.4 years↑
"Defender"
Goblin Elite Infantry82%
$0.09↓#30391↓0.0030.0 years
"Whenever this creature blocks or becomes blocked, it gets -1/-1 until end of turn."
Mobile Fort82%
$0.33↓#25484↓0.0028.0 years↓
"Defender"
Stoic Ephemera81%
$0.10↓#28010↓0.0020.5 years↓
"Defender"
Snow Fortress80%
$0.62↓#26244↓0.0031.4 years↑
"Defender"
Jungle Wurm78%
$0.09↓#31636↓0.0030.0 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↓#31616↓0.50↑31.4 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↓#31220↓0.1018.5 years↓
"Whenever this creature blocks or becomes blocked, it gets -3/-0 until end of turn."
Wall of Razors76%
$0.31↓#21851↓0.18↑28.6 years↓
"Defender"
Wall of Ice76%
$0.31↓#17299↓0.0633.2 years↑
"Defender"
Razorgrass Screen76%
$0.06↓#26698↓0.0022.4 years↓
"Defender"
Moat Piranhas76%
$0.16↓#25347↓0.007.3 years↓
"Defender"
Carnivorous Plant76%
$0.10↓#28633↓0.0032.2 years↑
"Defender"