Enchantments in Magic: The Gathering represent mystical effects or abstract concepts that don't necessarily make sense to print on an artifact
The first is a triggered ability: "When this permanent enters the battlefield, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle their library." (2018-06-08) Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren't included in the ability's reminder text
You need to cast two creatures to get your commanders full effect on the field, and you can synergize that extra commander-cast with cards like Captain Vargus Wrath and Genesis Storm
Were also throwing in a few editors picks that you should definitely keep on your radar
Darksteel is an old set, so near-mint foils are getting pretty hard to find, especially since there were so few foil copies printed in the first place