Foul Watcher is a common Creature — Nightmare Bird card from Modern Horizons 2 (MH2), collector number 43. Current market price: $0.14 (foil $0.33), TCGplayer market prices via Scryfall.
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.