Shapeshifting Fish

Changeling (This creature is every creature type at all times)
When Shapeshifting Fish comes into play, name
an ability. Shapeshifting Fish will have that ability in addition to the abilities he already has.
{u}{t}: Name a new ability. This named ability replaces the previously named ability.
{u}{u}: Put a +1/+1 counter on Shapeshifting Fish.