Oko - Can take the form of a swamp swallower

“If you could reach me, you certainly could. But forewarned is forearmed. Or four armed, if I decided to take the form of an Elagian swamp swallower. But that wouldn’t be a good choice for a highland forest, would it? So I fear we must say goodbye to each other before any such disagreeable episode comes to pass. Not the swamp swallower, I mean, though they are disagreeable, dangerous to magic users, and fetid to boot, rather like you. Killing me is what I mean. You’ll understand why I’d prefer that not happen.”

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Throne of Eldraine: The Wildered Quest, Part One: Harvest