It was toxic but sigle target dmg which cant be dodged was unique. Now bird skill is boring delayed, hard to weave spamable + a few animal companion(AC) passive procs. Nothing special about it left. There should be another thing to add.
A lacking list to just give a few examples:
Refund if dodged: still a bit boring skill, i think this can be baseline
Big dmg buff but each subsequent hit reduces dmg: needed dmg boost for pve, burst potantial for pvp (this effect can be mag morp, stamwarden is already bursty. magwarden need pve dd boost too)
-Apply a unique or a common debuff: can be anything
-Go through block: immortals tanks wont feel it anyways
-Cause other AC skills to deal additional dmg: "next AC skill deal %X dmg to marked target.expires within X seconds if you dont cast AC dmg skill" OR "all AC skills deal %X more dmg to marked target for X seconds." First one is similar to cruel flury (vMA daggers) and will help mag wardens dps with fetcher infection. If this buff makes stamwarden more bursty, make it mag morp.
-Next class skill will be cheaper: a super cheap dmg source
What they can add dont matter but just nerfing without any buff is bad for skill. What they remove was all bird skill had.