Tree Form

Last night i decided to play a bit with my retardin, doing some daily's, random dungeon here, titanium vein there. Just casual play. However i cant help to being inspired by a certain aspect of a retri pal, Vengeance.

So each time i critted with something i got a buff of 3% more dmg, stacking to 3.
Later on i thought if they could combine something alike and tree form.
I'll explain what i mean.

if you crit with a healing spell you get 3% more healing stacking to 3, the more stacks you get the more you transform into a tree(maybe casting dmg spells takes off the buff or something).

This would keep Tree of Life as a element of resto druids and at the same time would entirely change the way of the ability.