Your thing can be basically anything, but this is easiest to see if we look to Kindred decks having a critical mass of creatures of your chosen type and/or cards that care about that type is crucial to amassing synergies and building a board
"But most of the holos are going to have silvering across the top and the right side of the border." In terms of the common issues found on these cards, Browning notes that it's mostly "surface condition versus edge wear and factory nicks." For example, besides the aforementioned silvering, he often sees print lines on the cards as well
Theyre powerful, immortal, and they come with a whole host of awesome powers
I suppose it also plays well with Teferi, Time Raveler against tokens or Hangarback Walker / Walking Ballista I mentioned this as a sideboard option
If singles become worthless, that part of their business would be gone overnight