Afflicted Deserter // Werewolf Ransacker — ruling 1

If the targeted artifact has indestructible or regenerates (or you choose not to destroy it), Werewolf Ransacker doesn't deal damage to that artifact's controller. Similarly, if the targeted artifact is destroyed but a replacement effect moves it to a different zone instead of its owner's graveyard, Werewolf Ransacker doesn't deal damage to that artifact's controller.

Afflicted Deserter // Werewolf Ransacker — ruling 2

You choose the target artifact when Werewolf Ransacker's first triggered ability goes on the stack. You choose whether or not to destroy the artifact when that ability resolves.

Afflicted Deserter // Werewolf Ransacker — ruling 3

An artifact token that's destroyed is put into its owner's graveyard before it ceases to exist. If a token is destroyed by Werewolf Ransacker ability, Werewolf Ransacker deals damage to that token's controller.

Afflicted Deserter // Werewolf Ransacker — ruling 4

If something becomes a copy of Werewolf Ransacker, that doesn't count as "transforming into Werewolf Ransacker." The first triggered ability of the new Werewolf Ransacker doesn't trigger.

Afflicted Deserter // Werewolf Ransacker : règles, fonctionnement et interactions (MTG)

Afflicted Deserter // Werewolf Ransacker 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

At the beginning of each upkeep, if no spells were cast last turn, transform this creature. Whenever this creature transforms into Werewolf Ransacker, you may destroy target artifact. If that artifact is put into a graveyard this way, this creature deals 3 damage to that artifact's controller. At the beginning of each upkeep, if a player cast two or more spells last turn, transform this creature.

How it works : Afflicted Deserter // Werewolf Ransacker

Original English text — Wizards of the Coast / Scryfall

#1July 1, 2013· Wizards of the Coast
If the targeted artifact has indestructible or regenerates (or you choose not to destroy it), Werewolf Ransacker doesn't deal damage to that artifact's controller. Similarly, if the targeted artifact is destroyed but a replacement effect moves it to a different zone instead of its owner's graveyard, Werewolf Ransacker doesn't deal damage to that artifact's controller.
No other card is named in this ruling.
#2January 22, 2011· Wizards of the Coast
You choose the target artifact when Werewolf Ransacker's first triggered ability goes on the stack. You choose whether or not to destroy the artifact when that ability resolves.
No other card is named in this ruling.
#3January 22, 2011· Wizards of the Coast
An artifact token that's destroyed is put into its owner's graveyard before it ceases to exist. If a token is destroyed by Werewolf Ransacker ability, Werewolf Ransacker deals damage to that token's controller.
No other card is named in this ruling.
#4January 22, 2011· Wizards of the Coast
If something becomes a copy of Werewolf Ransacker, that doesn't count as "transforming into Werewolf Ransacker." The first triggered ability of the new Werewolf Ransacker doesn't trigger.
No other card is named in this ruling.