Mana Cannons 
Enchantment
$0.57 #9707 0.20 4.1 years
Whenever you cast a multicolored spell, this enchantment deals X damage to any target, where X is the number of colors that spell is.
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Pyroconvergence95%
$0.14↓#26681↓0.2514.0 years↑
"Whenever you cast a multicolored spell, this enchantment deals 2 damage to any target."
Pyromancer's Assault82%
$0.11↓#23107↓0.1110.7 years↑
"Whenever you cast your second spell each turn, this enchantment deals 2 damage to any target."
Labyrinth Champion82%
$0.17↓#25256↓0.07↓13.1 years↑
"Whenever you cast a spell that targets this creature, this creature deals 2 damage to any target."
Embersmith82%
$0.13↓#29794↓0.06↓16.1 years↑
"Whenever you cast an artifact spell, you may pay 
. If you do, this creature deals 1 damage to any target."
. If you do, this creature deals 1 damage to any target."
Molten Nursery81%
$0.15↓#23441↓0.1111.0 years↑
"Whenever you cast a colorless spell, this enchantment deals 1 damage to any target."
Rumbling Aftershocks81%
$0.07↓#30896↓0.07↓16.7 years↑
"Whenever you cast a kicked spell, you may have this enchantment deal damage to any target equal to the number of times that spell was kicked."
Imminent Doom81%
$0.13↓#25326↓0.219.3 years↑
"Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment."
Dreamstalker Manticore80%
$0.12↓#26946↓0.126.7 years↑
"Whenever you cast your first spell during each opponent's turn, this creature deals 1 damage to any target."
Burning Vengeance80%
$0.12↓#13147↓0.1215.1 years↑
"Whenever you cast a spell from your graveyard, this enchantment deals 2 damage to any target."
Crystal, Inhuman Princess79%
$0.46↓#114460.47↑0.3 years↓
"Whenever you cast a noncreature spell, this card deals X damage to each opponent, where X is the number of colors that spell is."
Surtr, Fiery Jötun78%
$10.52↑#7429↑0.292.3 years↓
"Whenever you cast a historic spell, this card deals 3 damage to any target."
Gloryscale Viashino78%
$0.15↓#24799↓0.07↓17.5 years↑
"Whenever you cast a multicolored spell, this creature gets +3/+3 until end of turn."
Sphinx-Bone Wand77%
$0.42↓#15493↓0.06↓16.5 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."
Ancient Cornucopia77%
$1.48↑#78320.33↑2.5 years↓
"Whenever you cast a spell that's one or more colors, you may gain 1 life for each of that spell's colors. Do this only once each turn."
Screamer-Killer76%
$0.58↑#98850.65↑4.0 years
"Whenever you cast a creature spell with mana value 5 or greater, this creature deals 5 damage to any target."
Sarkhan's Unsealing76%
$1.03↑#6189↑0.53↑8.3 years↑
"Whenever you cast a creature spell with power 4, 5, or 6, this enchantment deals 4 damage to any target."
Kamahl, Pit Fighter76%
$0.20↓#18568↓0.1325.1 years↑
"
: this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Irencrag Pyromancer76%
$0.35↓#77720.06↓7.0 years↑
"Whenever you draw your second card each turn, this creature deals 3 damage to any target."
Stormscale Anarch76%
$0.26↓#31848↓0.06↓20.5 years↑
", Discard a card at random: This creature deals 2 damage to any target. If the discarded card was multicolored, this creature deals 4 damage instead."
, Discard a card at random: This creature deals 2 damage to any target. If the discarded card was multicolored, this creature deals 4 damage instead."
Hero of Precinct One75%
$0.26↓#88890.00↓7.7 years↑
"Whenever you cast a multicolored spell, create a 1/1 white Human creature token."