In short, blink effects are a powerful trick that can throw a wrench in your opponent's plans at a crucial moment
For my example commander, lets start with Food synergies
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." 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
Alan has been writing about PC tech since before 3D graphics cards existed, and still vividly recalls having to fight with MS-DOS just to get games to load
Secret cards are usually quite rare compared to the officially numbered ones in a deck, though there are exceptions