"Basically, we turn a bunch of little lightnings into one big lightning."

Electrodominance

Electrodominance deals X damage to any target. You may cast a spell with mana value X or less from your hand without paying its mana cost.

Electrodominance deals X damage to any target. You may cast a card with converted mana cost X or less from your hand without paying its mana cost.

Tarkir: Dragonstorm Commander

Where There's Thunder, There's Lightning—Blaster Disaster Vaporizes Safety Inspector!