Omukade

Flying, Menace
Venomous Skin — Whenever a creature deals
damage to Omukade, Omukade deals 4 (1d8)
damage to that creature. (Decide before the game
to use average damage or roll for damage. You can't
change your mind partway through. That's bad form.)
Saliva-Phobia — Creatures and planeswalkers
that would bite Omukade have protection from
Omukade. (Discuss.)
Artwork/creature source:
https://www.youtube.com/watch?v=7FpLmuGXrKs