Lets look at a sample Gifts pile
Additionally, Plague Engineer lines up well against tokens strategies, and is surprisingly effective at dealing with cards like Bloodghast out of graveyard decks
An investment in knowledge pays the best interest, so I listen to podcasts
Contagion Clasp, Yawgmoth, Thran Physician, and Glistening Oil all come to mind as must-haves, and Im sure you can think of some more when you build the deck
Your opponent is going to have countermeasures, and by diversifying your sideboard package you force them to diversify those countermeasures, which means bringing in more cards than they would like and cutting into their core pieces
While these are definitely more common than the sets Headliner, they still appear in less than 1% of Collector Boosters, and the early prices reflect that