Parallectric Feedback 
Instant
$0.33 #26477 0.00 20.7 years
Parallectric Feedback deals damage to target spell's controller equal to that spell's mana value.
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Refuse // Cooperate92%
$0.16↓#17195↑0.069.3 years↓
"this card deals damage to target spell's controller equal to that spell's mana value."
Friendly Fire91%
$0.04↓#277940.27↑11.7 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%
$0.32↓#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."
Hellhole Rats84%
$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 Fury84%
$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."
Hit // Run80%
$0.19↓#284880.25↑20.5 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."
Kaervek the Merciless80%
$0.29↓#2693↑0.80↑20.0 years
"Whenever an opponent casts a spell, Kaervek deals damage equal to that spell's mana value to any target."
Viashino Heretic78%
$0.40↑#13527↑0.20↑27.7 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 Purge75%
$0.28↓#281390.25↑30.0 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."
Word of Blasting72%
$0.17↓#32034↓0.11↑31.4 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%
$10.66↑#2477↑0.99↑2.1 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."
Gaze of Adamaro71%
$0.21↓#20590↑0.0521.4 years
"this card deals damage to target player equal to the number of cards in that player's hand."
Enchanter's Bane70%
$0.29↓#10145↑0.33↑8.2 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↓#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."
Armor Wars70%
$0.25↓#12970↑0.25↑0.3 years↓
"This Saga deals X damage to target opponent, where X is the greatest mana value among artifacts you control."
Sudden Impact70%
$0.16↓#19169↑0.12↑29.0 years↑
"this card deals damage to target player equal to the number of cards in that player's hand."
Orim's Thunder70%
$0.04↓#16993↑0.0025.4 years↑
"Destroy target artifact or enchantment. If this spell was kicked, it deals damage equal to that permanent's mana value to target creature."
Disdainful Stroke70%
$0.09↓#2356↑0.34↑12.1 years↓
"Counter target spell with mana value 4 or greater."