Searching your library for anything is considered an incredibly powerful ability, so Ratcatcher is likely to become a removal magnet
What else can be said
OTJ features just under 30 cards with the commit a crime text on them, while many other cards in the set count as committing crimes, including desert lands that ping an opponent when they enter the battlefield
And you are also shooting something for two damage, giving your dork +2/+2, and the protection from Red and Blue increase the chance of hitting for a card quite nicely
If your deck struggles against big, resilient threats, consider cards like Path to Exile or Leyline of the Void for graveyard recursion
While the victories of Junya Iyanaga and the Japanese National Team deserved their time in the spotlight, the equally impressive work of their countryman Seishiro Ohkubo was almost entirely overlooked