Angelic Guardian 
Creature — Angel
$3.34 #12574 0.17 7.8 years
Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever one or more creatures you control attack, they gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)
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Cards similar to Angelic Guardian 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.
Stonehoof Chieftain90%
$2.40↓#4790↑0.56↑9.8 years↑
"Whenever another creature you control attacks, it gains trample and indestructible until end of turn."
Hardened Escort90%
$0.15↓#15421↓0.05↓1.9 years↓
"Whenever this creature attacks, another target creature you control gets +1/+0 and gains indestructible until end of turn."
Iconic Shield90%
$0.32↓#25050↓0.00↓0.2 years↓
"Equipped creature gets +1/+2 and has "Whenever this creature attacks, another target attacking creature gains indestructible until end of turn.""
Captain America, Skybound90%
$0.91↓#17438↓0.00↓0.2 years↓
"Whenever this card and at least two other creatures attack, put a +1/+1 counter on each attacking creature. They gain indestructible until end of turn."
Frontline Medic86%
$0.20↓#3503↑0.32↑13.6 years↑
"Whenever this creature and at least two other creatures attack, creatures you control gain indestructible until end of turn."
Peggy Carter, Secret Agent86%
$0.26↓#20351↓0.00↓0.2 years↓
"Whenever a creature you control attacks alone, it gains indestructible until end of turn."
Foot Elite84%
$0.14↓#17814↓0.00↓0.5 years↓
"Whenever this creature attacks, another target creature you control gets +1/+0 and gains indestructible until end of turn."
Stalwart Pathlighter84%
$0.29↓#117030.06↓4.9 years↓
"At the beginning of combat on your turn, if you control three or more creatures with different powers, creatures you control gain indestructible until end of turn."
Ancestor Dragon84%
$0.27↓#140250.56↑8.2 years
"Flying"
Flawless Maneuver84%
$20.77↑#181↑1.00↑6.4 years↓
"Creatures you control gain indestructible until end of turn."
Selfless Spirit82%
$0.41↓#595↑0.2610.1 years↑
"Sacrifice this creature: Creatures you control gain indestructible until end of turn."
Cecil, Dark Knight // Cecil, Redeemed Paladin82%
$1.13↓#9296↑0.27↑1.2 years↓
"Whenever this card attacks, other attacking creatures gain indestructible until end of turn."
Make a Stand82%
$0.13↓#3316↑0.2310.6 years↑
"Creatures you control get +1/+0 and gain indestructible until end of turn."
Kindred Boon82%
$0.31↓#7284↑0.44↑9.0 years↑
"Each creature you control with a divinity counter on it has indestructible."
Dauntless Escort82%
$0.15↓#8021↑0.1017.3 years↑
"Sacrifice this creature: Creatures you control gain indestructible until end of turn."
Glory82%
$0.32↓#122880.59↑24.3 years↑
"Flying"
Salvation Colossus82%
$0.32↓#6963↑0.53↑2.2 years↓
"Whenever you attack, other creatures you control get +2/+2 and gain indestructible until end of turn."
Angelheart Protector82%
$0.11↓#22106↓0.06↓5.9 years↓
"When this creature enters, target creature you control gains indestructible until end of turn."
Fey Steed80%
$0.31↓#17144↓0.29↑5.1 years↓
"Whenever this creature attacks, another target attacking creature you control gains indestructible until end of turn."
Boros Charm80%
$4.87↑#180↑0.36↑13.6 years↑
"• Permanents you control gain indestructible until end of turn."