Foul Watcher is a common Creature — Nightmare Bird card from Jumpstart: Historic Horizons (J21), collector number 194.
Flying When this creature enters, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.) Delirium — This creature gets +1/+0 as long as there are four or more card types among cards in your graveyard.