War Historian 
Creature — Human Monk
$0.03 #30007 0.47 3.4 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%
$0.10↑#253430.86↑4.8 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%
$0.24↑#22102↑0.00↓7.9 years↑
"Defender, reach"
Agent Frank Horrigan79%
$5.51↑#3480↑0.30↓2.5 years
"this card has indestructible as long as it attacked this turn."
Thrashing Frontliner79%
$0.05↑#284660.00↓3.4 years
"Whenever this creature attacks a battle, it gets +1/+1 until end of turn."
Luke Cage, Power Man77%
$0.17↑#22076↑0.00↓0.2 years↓
"Whenever this card attacks alone, he gets +2/+0 and gains indestructible until end of turn."
Crew Captain77%
$0.04↑#242730.26↓4.4 years
"This creature has indestructible as long as it entered this turn."
Zopandrel, Hunger Dominus76%
$12.23↑#1180↑0.74↑3.6 years
"Reach"
Primaris Chaplain74%
$0.34↑#15308↑0.473.9 years
"Whenever this creature attacks, it gains indestructible until end of turn."
Weathered Sentinels72%
$0.97↑#2853↑0.25↓4.4 years
"Whenever this creature attacks, it gets +3/+3 and gains indestructible until end of turn."
Hercules, Olympian Hero72%
$0.29↑#16046↑0.00↓0.2 years↓
"Whenever this card attacks, put a +1/+1 counter on him. He gains indestructible until end of turn."
Adanto Vanguard71%
$0.19↑#16717↑0.15↓8.9 years↑
"As long as this creature is attacking, it gets +2/+0."
War-Trained Slasher71%
$0.17↑#247480.27↓3.4 years
"Whenever this creature attacks a battle, double its power until end of turn."