In Thrall to the Pit

If an effect allows In Thrall to the Pit to be cast during the end step and it is kicked, you will gain control of the target creature until this turn ends. The delayed triggered ability will trigger at the beginning of the next turn's end step, but you won't be able to sacrifice that creature because you no longer control it.

If you copy a kicked spell on the stack, the copy is also kicked. If the copied spell is a permanent spell, the token the copy of that spell becomes when it enters is also kicked.

To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.