Search the other pile for a card, put it into your hand, then shuffle the rest of that pile into your library
Fundamental Format Features Realistically, while it does seem that Key to the Archive flagrantly disregards color identity rules, this isnt a new problem
Of course, mono-blue counters is a less than loved archetype, shall we say
Its slow, but left unchecked it becomes massive
Displaced Dinosaurs makes every artifact token you make (Treasure, Clues, and Food come to mind) into 7/7 creatures, and its not hard to make a ton of artifact tokens these days, whether Treasure in Golgari or Clues in Simic
Zhalfirin Shapecraft overwrites all previous effects that set the creature's base power and toughness to specific values