Deepcavern Imp is a common Creature — Imp Rebel card from Time Spiral Remastered (TSR), collector number 110. Current market price: $0.05 (foil $0.35), TCGplayer market prices via Scryfall.
Flying, haste Echo—Discard a card. (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)