Mana Cannons 
Enchantment
$0.57 #9573 0.47 4.0 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.
Click a line or tag to filter
Cards similar to Mana Cannons 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.
Pyroconvergence95%
$0.11↓#26450↓0.19↓13.9 years↑
"Whenever you cast a multicolored spell, this enchantment deals 2 damage to any target."
Pyromancer's Assault82%
$0.10↓#22861↓0.19↓10.6 years↑
"Whenever you cast your second spell each turn, this enchantment deals 2 damage to any target."
Labyrinth Champion82%
$0.19↓#24879↓0.19↓12.9 years↑
"Whenever you cast a spell that targets this creature, this creature deals 2 damage to any target."
Embersmith82%
$0.13↓#29433↓0.11↓15.9 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%
$0.13↓#23255↓0.20↓10.9 years↑
"Whenever you cast a colorless spell, this enchantment deals 1 damage to any target."
Rumbling Aftershocks81%
$0.04↓#30597↓0.06↓16.6 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%
$0.15↓#25092↓0.31↓9.1 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↓#26487↓0.416.6 years↑
"Whenever you cast your first spell during each opponent's turn, this creature deals 1 damage to any target."
Burning Vengeance80%
$0.14↓#13056↓0.06↓14.9 years↑
"Whenever you cast a spell from your graveyard, this enchantment deals 2 damage to any target."
Crystal, Inhuman Princess79%
$1.09↑#12648↓0.00↓0.2 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%
$11.87↑#7295↑0.502.2 years↓
"Whenever you cast a historic spell, this card deals 3 damage to any target."
Gloryscale Viashino78%
$0.12↓#24402↓0.00↓17.3 years↑
"Whenever you cast a multicolored spell, this creature gets +3/+3 until end of turn."
Sphinx-Bone Wand77%
$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."
Ancient Cornucopia77%
$4.74↑#81890.00↓2.4 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%
$0.54↓#96650.27↓3.9 years
"Whenever you cast a creature spell with mana value 5 or greater, this creature deals 5 damage to any target."
Sarkhan's Unsealing76%
$1.07↑#6237↑0.11↓8.1 years↑
"Whenever you cast a creature spell with power 4, 5, or 6, this enchantment deals 4 damage to any target."
Kamahl, Pit Fighter76%
$0.18↓#18157↓0.5024.9 years↑
"
: this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Irencrag Pyromancer76%
$0.42↓#76780.506.9 years↑
"Whenever you draw your second card each turn, this creature deals 3 damage to any target."
Moonveil Regent75%
$0.35↓#17413↓0.29↓4.9 years
"When this creature dies, it deals X damage to any target, where X is the number of colors among permanents you control."
Stormscale Anarch75%
$0.25↓#31575↓0.4720.3 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."