Chaotic Backlash — ruling 1

Each permanent is counted only once. For example, if the targeted player controls a white creature, a blue enchantment, and a white-blue creature, Chaotic Backlash will deal 6 damage to that player.

Chaotic Backlash : règles, fonctionnement et interactions (MTG)

Chaotic Backlash is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Chaotic Backlash deals damage to target player equal to twice the number of white and/or blue permanents they control.

How it works : Chaotic Backlash

Original English text — Wizards of the Coast / Scryfall

#1August 1, 2008· Wizards of the Coast
Each permanent is counted only once. For example, if the targeted player controls a white creature, a blue enchantment, and a white-blue creature, Chaotic Backlash will deal 6 damage to that player.
No other card is named in this ruling.