Equip variants or equip abilities with restrictions, like the "equip legendary creature" ability of Wrecking Ball Arm, are still equip abilities, and their costs will be reduced by Cloud's last ability
Yet if you check the Stronghold original printing Source: MTGStocks the story is completely different: a 140% increase in the last week, going from about $2.50 to over $6, thanks to competitive play like Angry Elves decks in Premodern
You will usually want to bounce one of your opponent's characters for the tempo gain, but you could also play him in a bounce deck and bounce one of your own things
Lithoform Engine is a really, really good card
Choose a Zombie-focused commander that clearly supports one main strategy, such as tokens, recursion, or sacrifice