This card is completely useless outside of a combo and, even therein, is slow to be of use. Poisoning this and catapulting it would be less efficient damagewise than poisoning a Voodoo Doll and require an extra card. Admittedly, it can do more than 16 damage but it doesn't transfer poison like the doll either. Meaning that the doll essentially outdamages the tree even then.
Buffing the attack of this creature would be a way to keep the buff around more reliably than putting it on any similarly costed creature but, at the same time, you can do a lot more damage for 3|2 quanta and buffing tough little guys like Graviton Salvager is hardly a common strategy. As a mass attack buff, Nightfall poses the highest potential to that strategy but Vampires and Devourers already outclass the tree in that synergy.
In short, it feels week and poorly implemented. Perhaps the ability could better serve as an anti-death mechanic in life but, even then, it would be highly niche and require something else aswell to make the card worthwhile.