Explosive Runes is a 3 Mana Cost Rare Mage Spell card from the Kobolds and Catacombs set!
Secret: After your opponent plays a minion, deal 6 damage to it and any excess to their hero.
Flavor TextSometimes it's safer NOT to read the warning signs.
Explosive Runes Additional Information
This is likely a better translation, but we haven’t gotten official word yet.