Arbitrary
Tranny Chaser
Both the Equip ability and the other Attach ability are activated abilities and not spells. After a Cranial Plating or any other permanent resolves and is on the battlefield it is no longer a spell and won't ever be a spell again unless it is returned to the player's hand and the choose to play it again. A renowned Scab-Clan Berserker will never do damage to a player for using an activated ability.
In comparison -
Burning-Tree Shaman (Guildpact) - Gatherer - Magic: The Gathering
This would do damage when someone equipped a Cranial Plating or when they paid the alternative attach cost but never when it was cast.
In comparison -
Burning-Tree Shaman (Guildpact) - Gatherer - Magic: The Gathering
This would do damage when someone equipped a Cranial Plating or when they paid the alternative attach cost but never when it was cast.