War Historian 
Creature — Human Monk
$0.03 #30190 0.00 3.5 years
Reach
This creature has indestructible as long as it attacked a battle this turn.
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Cards similar to War Historian 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.
Estwald Shieldbasher84%
$0.15↑#257740.004.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, it gains indestructible until end of turn."
. If you do, it gains indestructible until end of turn."
Grappling Sundew80%
$0.21↑#22434↑0.068.0 years↑
"Defender, reach"
Agent Frank Horrigan79%
$3.33↑#3561↑0.40↑2.6 years
"this card has indestructible as long as it attacked this turn."
Thrashing Frontliner78%
$0.05↑#287890.003.5 years
"Whenever this creature attacks a battle, it gets +1/+1 until end of turn."
Luke Cage, Power Man78%
$0.15↑#21487↑0.23↑0.3 years↓
"Whenever this card attacks alone, he gets +2/+0 and gains indestructible until end of turn."
Crew Captain78%
$0.03#247080.064.5 years
"This creature has indestructible as long as it entered this turn."
Zopandrel, Hunger Dominus76%
$11.70↑#1204↑0.72↑3.7 years
"Reach"
Primaris Chaplain74%
$0.29↑#15648↑0.47↑4.0 years
"Whenever this creature attacks, it gains indestructible until end of turn."
Weathered Sentinels73%
$1.04↑#2813↑0.30↑4.5 years
"Whenever this creature attacks, it gets +3/+3 and gains indestructible until end of turn."
Hercules, Olympian Hero72%
$0.30↑#15057↑0.38↑0.3 years↓
"Whenever this card attacks, put a +1/+1 counter on him. He gains indestructible until end of turn."
Peggy Carter, Secret Agent72%
$0.24↑#19151↑0.090.3 years↓
"Whenever a creature you control attacks alone, it gains indestructible until end of turn."
Adanto Vanguard71%
$0.16↑#16945↑0.069.1 years↑
"As long as this creature is attacking, it gets +2/+0."
War-Trained Slasher71%
$0.17↑#251340.11↑3.5 years
"Whenever this creature attacks a battle, double its power until end of turn."