Of course, these methods are all focused on short term flipping
You'll wait a bit, but a two-mana copy of a sacrificed artifact is worth the delay since you can break this all around the block
In the past few years, the Pikachu Illustrator Japanese promo card has witnessed a massive increase in its price
With the amount of cards you can play from exile and the graveyard (not to mention the new Plot cards), Doc AurlockDoc Aurlock will be sure to see lots of play, both in the command zone and the 99 of decks like MuldrothaMuldrotha, Grolnok, the OmnivoreGrolnok, the Omnivore, Niv-Mizzet, SupremeNiv-Mizzet, Supreme, Gonti, Canny AcquisitorGonti, Canny Acquisitor, Riku of Many PathsRiku of Many Paths, and probably best of all, PakoPako and HaldanHaldan
And we're not even in the top 10 yet
Use the available cards in your collection first where possible