Elderwood Nautilus
It would look similar to elder wood Hecarim but with blue leaves and would have moss and flowers growing on him. His anchor could be replaced by a tree attached by a root, along with visual effects for his abilties.
Q-unchanged
W-green aura
E-stumps
R-when following a champ it would have a similar visual like Zyras strangle thorns and when it hits, a tree rises from the ground