Whattle Springkeeper

Defender
{t}, add two +1/+1 counters to target merfolk,
siren, or beast creature.
{g/u}{g/u}{g/u}{3}, add a +1/+1 counter to all creatures
you control.
As long as Whattle Springkeeper has a +1/+1 counter,
it can attack as if it didn't have defender.