Sphere of Duty 
Enchantment
$0.21 #28636 0.12 24.9 years
If a green source would deal damage to you, prevent 2 of that damage.
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Cards similar to Sphere of Duty 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.
Circle of Protection: Green90%
$0.09↓#20918↑0.1333.1 years↑
"
: The next time a green source of your choice would deal damage to you this turn, prevent that damage."
: The next time a green source of your choice would deal damage to you this turn, prevent that damage."
Sphere of Truth88%
$0.30↑#297560.00↓24.9 years
"If a white source would deal damage to you, prevent 2 of that damage."
Rune of Protection: Green87%
$0.12↓#244010.47↑27.9 years↑
": The next time a green source of your choice would deal damage to you this turn, prevent that damage."
: The next time a green source of your choice would deal damage to you this turn, prevent that damage."
Protection of the Hekma87%
$0.18↓#258650.00↓9.4 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Guardian Seraph86%
$0.55↑#20983↑0.42↑17.1 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Sphere of Grace84%
$0.25↑#287050.43↑24.9 years
"If a black source would deal damage to you, prevent 2 of that damage."
Sphere of Reason83%
$0.24↑#297700.36↑24.9 years
"If a blue source would deal damage to you, prevent 2 of that damage."
Urza's Armor82%
$0.24↑#20570↑0.28↑27.9 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Sphere of Law82%
$0.61↑#275880.53↑24.9 years
"If a red source would deal damage to you, prevent 2 of that damage."
Orbs of Warding80%
$0.56↑#13137↑0.0611.1 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Hedron-Field Purists80%
$0.36↑#22327↑0.31↑16.4 years↓
"If a source would deal damage to you or a creature you control, prevent 2 of that damage."
Sphere of Purity78%
$0.02↓#305610.42↑22.9 years↓
"If an artifact would deal damage to you, prevent 1 of that damage."
Woodlot Crawler77%
$0.05↓#287710.0613.3 years↓
"Protection from green"
Zombie Outlander77%
$0.20↓#286720.0617.6 years↓
"Protection from green"
Vodalian Zombie77%
$0.12↓#299700.0525.9 years
"Protection from green"
Wanderbrine Rootcutters76%
$0.07↓#315400.22↑18.3 years↓
"This creature can't be blocked by green creatures."
Plated Pegasus75%
$0.34↑#22182↑0.31↑19.9 years↓
"If a spell would deal damage to a permanent or player, prevent 1 damage that spell would deal to that permanent or player."
Cerulean Wyvern74%
$0.09↓#306620.44↑29.9 years↑
"Flying, protection from green"
Coast Watcher74%
$0.09↓#242530.00↓23.3 years↓
"Flying, protection from green"
Treetop Sentinel74%
$0.32↑#301600.1124.9 years
"Flying, protection from green"