Harpin, Lady of the Deep

Harpin, Lady of the Deep's power is equal to the number of Tentacles you control.
Whenever a nontoken blue permanent enters the battlefield, create a 1/1 blue Tentacle creature
token. Whenever a nontoken black permanent
enters the battlefield, put a +1/+1 counter on
each Kraken, Tentacle, or Siren you control.
Why none dare set sail in the waters south of Ixalan.