Sphere of Duty 
Enchantment
$0.19 #29054 0.11 25.1 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?
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Circle of Protection: Green92%
$0.09↓#21095↑0.53↑33.2 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 Truth90%
$0.27↑#301110.0525.1 years
"If a white source would deal damage to you, prevent 2 of that damage."
Guardian Seraph85%
$0.61↑#21183↑0.1817.3 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Protection of the Hekma85%
$0.25↑#260850.47↑9.5 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Sphere of Grace84%
$0.27↑#290030.38↑25.1 years
"If a black source would deal damage to you, prevent 2 of that damage."
Sphere of Reason84%
$0.24↑#301580.1625.1 years
"If a blue source would deal damage to you, prevent 2 of that damage."
Rune of Protection: Green84%
$0.16↓#247690.0528.0 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 Law83%
$0.62↑#278970.32↑25.1 years
"If a red source would deal damage to you, prevent 2 of that damage."
Urza's Armor78%
$0.24↑#20775↑0.00↓28.0 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Orbs of Warding78%
$0.67↑#13293↑0.25↑11.3 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Hedron-Field Purists76%
$0.36↑#22676↑0.00↓16.5 years↓
"If a source would deal damage to you or a creature you control, prevent 2 of that damage."
Circle of Protection: White76%
$0.11↓#19318↑0.38↑33.2 years↑
": The next time a white source of your choice would deal damage to you this turn, prevent that damage."
: The next time a white source of your choice would deal damage to you this turn, prevent that damage."
Green Scarab76%
$0.27↑#260420.1231.4 years↑
"Enchanted creature can't be blocked by green creatures."
Sphere of Purity74%
$0.02↓#308170.0523.0 years↓
"If an artifact would deal damage to you, prevent 1 of that damage."
Wanderbrine Rootcutters72%
$0.07↓#319240.1218.5 years↓
"This creature can't be blocked by green creatures."
Vodalian Zombie72%
$0.14↓#302500.2026.0 years
"Protection from green"
Zombie Outlander72%
$0.27↑#289380.0617.7 years↓
"Protection from green"
Woodlot Crawler72%
$0.06↓#291120.00↓13.5 years↓
"Protection from green"
Plated Pegasus72%
$0.30↑#22267↑0.0620.0 years↓
"If a spell would deal damage to a permanent or player, prevent 1 damage that spell would deal to that permanent or player."
Circle of Protection: Black71%
$0.09↓#20837↑0.0633.0 years↑
": The next time a black source of your choice would deal damage to you this turn, prevent that damage."
: The next time a black source of your choice would deal damage to you this turn, prevent that damage."