The idea is that by putting all the Grim Haruspex effects together, you should discover plenty of cards you werent aware of for your decks, especially considering singleton formats like EDH which benefit from redundancy
Because of the lack of land destruction I am not really sure this has support or what kind of deck this goes in
However, as anyone who buys physical Pokmon booster packs knows, code cards found in packs can be redeemed in-game for digital boosters, so there is the option for players to throw down cash in order to flesh out their collections faster than regular gameplay would naturally allow
For the classic mono-black swarm, Marrow-Gnawer (the iconic token doubler) or Karumonix (the budget pick)
Tome Scour Another mill or Izzet staple, Tome Scour sits right alongside the previous Thought Scour in quite a few decks
Don't sleep on that, although you'll usually want a Red zone-caring critter