Sewer Crocodile is a common Creature — Crocodile card from Streets of New Capenna (SNC), collector number 60. Current market price: $0.07 (foil $0.34), TCGplayer market prices via Scryfall.
{3}{U}: This creature can't be blocked this turn. This ability costs {3} less to activate if there are five or more mana values among cards in your graveyard.