It has a dash cost of two mana, which allows it to come in with haste, but puts it back in your hand at the end of the turn
Your opponent doesn't play anything meaningful on their turn and simply says "Pass." You say, "During your post-combat Main Phase, activate my Insolent Neonate." You discard the Imp, dredge 5, and reveal two Prized Amalgams and a Narcomoeba
The best part is that the flying is a Flying Counter, so even after the spell resolves, you now have a flying attacker or blocker
Rapacious Guest is a great Food token creator, it grows every time we sacrifice a Food and on death trigger it can deal a considerable amount of damage to target opponent (equal to its power)
Depending on how rare this card is, it could sell for a few hundred dollars, even if its largely unplayable