Darksteel Mutation is a card Ive been using since I started playing Commander and I'll continue to fall back on this card when sticking to mostly Battlecruiser to Low Power decks, where removal is less abundant and optimized
Though not directly related to equipment, ability doublers are an excellent payoff for these cards as the best equipment are often those with strong triggered abilities, like Skullclamp and the Swords
Cards similar to Black Lotus include Lotus Petal, Archaeological Dig
Its hard to block profitably, but at the same time, its risky not to block it
However, MTG is about having fun and I think that if you can build creative decks using obscure mechanics, youre doing it right
They can be isolated on big expensive things that copy themselves, like Polyraptor