killing a phantom with thrown trident advancment

i was just messing around on my creative world, and threw a trident at a MOVING phantom and killed it, 

and then i got the idea that it should be an advancement

i think it could be called "bullseye" or something like that

and you have to THROW the trident at a MOVING phantom to get it 

it could possibly go in the adventure section of the advancments