Parallectric Feedback 
Instant
$0.35 #26152 0.21 20.6 years
Parallectric Feedback deals damage to target spell's controller equal to that spell's mana value.
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Friendly Fire91%
$0.05↓#276450.2511.6 years↓
"Target creature's controller reveals a card at random from their hand. this card deals damage to that creature and that player equal to the revealed card's mana value."
Ignite Memories90%
$0.39↑#12653↑0.60↑19.9 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."
Refuse // Cooperate88%
$0.16↓#16853↑0.07↓9.1 years↓
"Refuse deals damage to target spell's controller equal to that spell's mana value."
Hellhole Rats84%
$0.34↓#236710.1420.3 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 Fury84%
$0.22↓#271260.07↓25.6 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."
Kaervek the Merciless80%
$0.31↓#2567↑0.61↑19.9 years
"Whenever an opponent casts a spell, Kaervek deals damage equal to that spell's mana value to any target."
Hit // Run80%
$0.22↓#281390.00↓20.3 years
"Target player sacrifices an artifact or creature of their choice. Hit deals damage to that player equal to that permanent's mana value."
Viashino Heretic78%
$0.42↑#13097↑0.39↑27.6 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 Purge75%
$0.28↓#277230.2929.9 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."
Word of Blasting75%
$0.17↓#31714↓0.00↓31.3 years↑
"Destroy target Wall. It can't be regenerated. this card deals damage equal to that Wall's mana value to the Wall's controller."
The Lord of Pain72%
$9.82↑#2339↑0.97↑1.9 years↓
"Whenever a player casts their first spell each turn, choose another target player. this card deals damage equal to that spell's mana value to the chosen player."
Armor Wars72%
$0.27↓#13951↑0.00↓0.2 years↓
"This Saga deals X damage to target opponent, where X is the greatest mana value among artifacts you control."
Gaze of Adamaro70%
$0.23↓#20252↑0.2121.3 years
"this card deals damage to target player equal to the number of cards in that player's hand."
Enchanter's Bane70%
$0.62↑#9656↑0.42↑8.1 years↓
"At the beginning of your end step, target enchantment deals damage equal to its mana value to its controller unless that player sacrifices it."
Cerebral Eruption70%
$0.29↓#234600.1115.9 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."
Sudden Impact70%
$0.16↓#18982↑0.35↑28.9 years↑
"this card deals damage to target player equal to the number of cards in that player's hand."
Orim's Thunder70%
$0.05↓#16580↑0.00↓25.3 years↑
"Destroy target artifact or enchantment. If this spell was kicked, it deals damage equal to that permanent's mana value to target creature."
Disdainful Stroke70%
$0.13↓#2368↑0.2411.9 years↓
"Counter target spell with mana value 4 or greater."