Delney, Streetwise Lookout is a mythic Legendary Creature — Human Scout card from Murders at Karlov Manor Promos (PMKM), collector number 12p. Current market price: $34.24 (foil $35.54), TCGplayer market prices via Scryfall.
Creatures you control with power 2 or less can't be blocked by creatures with power 3 or greater. If a triggered ability of a creature you control with power 2 or less triggers, that ability triggers an additional time.