Feedback 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

Enchant enchantment At the beginning of the upkeep of enchanted enchantment's controller, this Aura deals 1 damage to that player.

Complete guide

Feedback is a classic blue Aura that punishes players for relying too heavily on their powerful global or local enchantments. By attaching this curse directly to another enchantment, you turn your opponent's own board state into a source of constant, inevitable damage. It is a subtle way for blue to apply pressure while controlling the pace of the game.

What Feedback Does

Feedback is an Aura with the specific 'Enchant enchantment' keyword, meaning it must be attached to an enchantment already on the battlefield. Its primary function is to trigger during the upkeep of the player who controls the enchanted permanent. Each turn, the Aura deals 1 damage to that player, creating a ticking clock that can slowly drain their life total.

How it Resolves Step by Step

First, you cast Feedback by targeting a legal enchantment on the battlefield. Once it resolves and enters the battlefield attached to that enchantment, it waits for the beginning of the enchanted enchantment's controller's upkeep phase. When that phase starts, the ability triggers and goes on the stack. When the trigger resolves, the player who controls the enchanted permanent is dealt 1 damage by the Feedback Aura itself.

Common Mistakes

A frequent error is assuming you can target any permanent; however, Feedback can only be attached to an enchantment. If the enchanted enchantment leaves the battlefield, Feedback is put into its owner's graveyard as a state-based action. Additionally, remember that the damage is dealt by the Aura, not the enchanted permanent, which can be relevant for effects that prevent or modify damage from specific sources.

When to Play Feedback

Feedback is most effective against 'Stax' or control decks that use non-creature enchantments to lock down the board. Since blue rarely has direct ways to destroy enchantments once they are in play, using Feedback allows you to punish the opponent for keeping those restrictive permanents on the field.

Interaction examples

Punishing Taxes

Rhystic Study

If your opponent has Rhystic Study in play, you can cast Feedback targeting it. During your opponent's next upkeep, Feedback will trigger and deal 1 damage to them. This creates a dilemma where they must decide if drawing cards is worth the life loss every turn.

Breaking Through the Defense

Propaganda

When an opponent uses Propaganda to stop your attacks, you can enchant their Propaganda with Feedback. Now, even if you cannot afford to pay the mana to attack, your opponent will still lose 1 life during each of their upkeep steps because they control the enchanted Propaganda.

Understanding Mana Value Triggers

Parallectric Feedback

If an opponent casts Feedback, you can respond with Parallectric Feedback. Parallectric Feedback will deal 3 damage to the opponent (the spell's mana value) before their Feedback even enters the battlefield. Note that Feedback Bolt is different, as it checks your artifact count rather than the Aura's traits.

Guide written with AI from the official text and rulings. Official English text prevails.