Episode 15 "The Day The Magic Died"
The episode where her father comes to visit her with his new wife and the charmed ones loose their powers. Piper has her first child Wyatt, in season 5 episode 15 called "The Day the Magic Died.
On the episode "A Call To Arms" Piper receives extra arms making her have 8. In this episode Piper and Leo receive powers of Hindu Gods. This is the first episode of season 7.
I do not know the name of the episode but I am pretty sure there is at least one episode were Leo tickles Piper.
Scry Hard
In 3x15 "Just Harried"
Witch trial the frist episode of season 2
blinking was introduced into charmed in season 1 episode 9 "the witch is back" when Melinda Warren (prue, piper, phoebe, and paige's ancestor) returns when she is resurected. Also that is the first episode when they resurect an ancestor.
that episode is called scry hard
i dont remember the name but its season 2 episode 4
It is the episode 'Just Harried' and it should be on the 4th disc, second episode...
either season 5 episode 15 or season 6 episode 23
Forever Charmed, the series finale