Friendly Fire 
Instant
$0.04 #27794 0.27 11.7 years
Target creature's controller reveals a card at random from their hand. Friendly Fire deals damage to that creature and that player equal to the revealed card's mana value.
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Cards similar to Friendly Fire 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.
Ignite Memories92%
$0.32↑#12879↑0.42↑20.0 years↑
"Target player reveals a card at random from their hand. this card deals damage to that player equal to that card's mana value."
Parallectric Feedback91%
$0.33↑#264770.00↓20.7 years↑
"this card deals damage to target spell's controller equal to that spell's mana value."
Planeswalker's Fury87%
$0.24↑#274190.41↑25.7 years↑
": Target opponent reveals a card at random from their hand. This enchantment deals damage equal to that card's mana value to that player. Activate only as a sorcery."
: Target opponent reveals a card at random from their hand. This enchantment deals damage equal to that card's mana value to that player. Activate only as a sorcery."
Planeswalker's Scorn84%
$0.28↑#301090.16↓25.7 years↑
"
: Target opponent reveals a card at random from their hand. Target creature gets -X/-X until end of turn, where X is the revealed card's mana value. Activate only as a sorcery."
: Target opponent reveals a card at random from their hand. Target creature gets -X/-X until end of turn, where X is the revealed card's mana value. Activate only as a sorcery."
Refuse // Cooperate82%
$0.16↑#17195↑0.06↓9.3 years↓
"this card deals damage to target spell's controller equal to that spell's mana value."
Singe-Mind Ogre82%
$0.10↑#293660.2017.5 years↑
"When this creature enters, target player reveals a card at random from their hand, then loses life equal to that card's mana value."
Planeswalker's Favor82%
$0.39↑#285240.06↓25.7 years↑
"
: Target opponent reveals a card at random from their hand. Target creature gets +X/+X until end of turn, where X is the revealed card's mana value."
: Target opponent reveals a card at random from their hand. Target creature gets +X/+X until end of turn, where X is the revealed card's mana value."
Hit // Run78%
$0.19↑#284880.2520.5 years↑
"Target player sacrifices an artifact or creature of their choice. this card deals damage to that player equal to that permanent's mana value."
Hellhole Rats76%
$0.38↑#241170.39↑20.5 years↑
"When this creature enters, target player discards a card. This creature deals damage to that player equal to that card's mana value."
Planeswalker's Mirth76%
$0.30↑#298740.07↓25.7 years↑
"
: Target opponent reveals a card at random from their hand. You gain life equal to that card's mana value."
: Target opponent reveals a card at random from their hand. You gain life equal to that card's mana value."
Aether Mutation75%
$0.22↑#20025↑0.11↓25.4 years↑
"Return target creature to its owner's hand. Create X 1/1 green Saproling creature tokens, where X is that creature's mana value."
Orim's Thunder74%
$0.04#16993↑0.00↓25.4 years↑
"Destroy target artifact or enchantment. If this spell was kicked, it deals damage equal to that permanent's mana value to target creature."
Cerebral Eruption72%
$0.29↑#238070.15↓16.1 years↑
"Target opponent reveals the top card of their library. this card deals damage equal to the revealed card's mana value to that player and each creature that player controls. If a land card is revealed this way, return this card to its owner's hand."
Viashino Heretic72%
$0.40↑#13527↑0.2027.7 years↑
"
, 
: Destroy target artifact. This creature deals damage to that artifact's controller equal to the artifact's mana value."
, : Destroy target artifact. This creature deals damage to that artifact's controller equal to the artifact's mana value."
Kaervek's Purge70%
$0.28↑#281390.2530.0 years↑
"Destroy target creature with mana value X. If that creature dies this way, this card deals damage equal to the creature's power to the creature's controller."