Aria of Flame 
Enchantment
$0.54 #8183 0.45 7.2 years
When this enchantment enters, each opponent gains 10 life.
Whenever you cast an instant or sorcery spell, put a verse counter on this enchantment, then it deals damage equal to the number of verse counters on it to target player or planeswalker.
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Sentinel Tower84%
$2.60↑#9886↓0.478.2 years↑
"Whenever an instant or sorcery spell is cast during your turn, this artifact deals damage to any target equal to 1 plus the number of instant and sorcery spells cast before that spell this turn."
Sphinx-Bone Wand79%
$0.44↓#15169↓0.32↓16.4 years↑
"Whenever you cast an instant or sorcery spell, you may put a charge counter on this artifact. If you do, this artifact deals damage equal to the number of charge counters on it to any target."
Sorcerer Class78%
$2.50↑#3775↑0.19↓5.1 years↓
"Whenever you cast an instant or sorcery spell, that spell deals damage to each opponent equal to the number of instant and sorcery spells you've cast this turn."
Centaur Peacemaker77%
$0.16↓#25642↓0.00↓7.9 years
"When this creature enters, each player gains 4 life."
Electrostatic Field74%
$0.96↑#1587↑0.28↓7.9 years
"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent."
Weaver of Lightning74%
$0.09↓#20557↓0.07↓10.1 years↑
"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to target creature an opponent controls."
Caldera Pyremaw73%
$0.39↓#4521↑0.32↓1.4 years↓
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. Then this creature deals damage equal to its power to target opponent."
Guttersnipe73%
$0.22↓#404↑0.4313.9 years↑
"Whenever you cast an instant or sorcery spell, this creature deals 2 damage to each opponent."
Erebor Flamesmith73%
$0.49↓#2409↑0.19↓3.2 years↓
"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent."
Furious Assault73%
$0.13↓#25326↓0.3826.9 years↑
"Whenever you cast a creature spell, this enchantment deals 1 damage to target player or planeswalker."
Leyline of Lightning72%
$0.24↓#12985↓0.27↓20.6 years↑
"Whenever you cast a spell, you may pay 
. If you do, this enchantment deals 1 damage to target player or planeswalker."
. If you do, this enchantment deals 1 damage to target player or planeswalker."
Firemind's Research72%
$0.35↓#13379↓0.29↓7.9 years
"Whenever you cast an instant or sorcery spell, put a charge counter on this enchantment."
Thousand-Year Storm71%
$1.08↑#1409↑0.64↑7.9 years
"Whenever you cast an instant or sorcery spell, copy it for each other instant and sorcery spell you've cast before it this turn. You may choose new targets for the copies."
Smoldering Egg // Ashmouth Dragon70%
$0.35↓#10454↓0.394.9 years↓
"Whenever you cast an instant or sorcery spell, this creature deals 2 damage to any target."
Ral, Storm Conduit70%
$0.89↑#3606↑0.387.3 years
"Whenever you cast or copy an instant or sorcery spell, this card deals 1 damage to target opponent or planeswalker."