There are two main uses: to treat a blessing as a curse in a blessing deck and aim for a draw, and to use it as insurance against a curse in a curse deck
Tetsuo, Imperial Champion offers an interesting take on these types of decks, rewarding you for expensive equipment rather than the cheap efficient ones that most commanders prefer
Now, all of a sudden, all the Clues you pile up aren't just future card advantage, but they're now also extra Artifacts that can be tapped, sacrificed, or otherwise turned into mana and value, which makes the whole engine feel a lot more explosive than it first appears
Doubly so if it comes down and fails to do anything useful with the 3 damage
The best sac outlets are always going to be ones that don't cost mana, are repeatable, can be used at instant speed, and have some worthwhile payoff
A collector listed on eBay the entire collection of all 67 trophy cards for $9 million