I have Under the Porch. A play the Action and Sacrifice Under the Porch. But my opponet play a Power Drain. ¿What happen?

• Under the Porch go to discard pile, and his effect has not effect? isn't?

========== Shub-Niggurath ==========

Under the Porch
---------------
Type : Support
Cost : 3
Subtype : Location.
Game Text : Action: Sacrifice Under the Porch to search your deck for a [shub-Niggurath] character, and put it into play under your control. At the end of the phase, return that character to its owner’s hand.
Flavor text : And there it lingers, waiting for the right moment to strike.
Illustrator : Raya Golden
Collector's Info : AHS F36

And if my opponent cancel a Shocking Transformation? (i was sacrifing a cultist)

• My shocking transformation go to discard pile, and my cultist too.
• Only my shocking transformation go to discard pile

You still pay the cost (sacrifice) but don't get the result (bring into play...).

Let me be a bit more clear - you don't even get to search your deck. Everything before "to" is the cost - you still do that. Everything after "to" is the effect, you don't get that because Power Drain canceled it.