Dralnu's Pet is a rare Creature — Shapeshifter card from Planeshift (PLS), collector number 23. Current market price: $0.27 (foil $2.76), TCGplayer market prices via Scryfall.
Kicker—{2}{B}, Discard a creature card. (You may pay {2}{B} and discard a creature card in addition to any other costs as you cast this spell.) If this creature was kicked, it enters with flying and with X +1/+1 counters on it, where X is the discarded card's mana value.