Free Steam Game Code - Daily Riddle #66 100% POWERUP-WEEK

welcome to the daily riddle #66!
We want to combine steemit.com and steam.com, so you can win one steam game everyday.
Solve the riddle and grab the random steam game code.

Rules:

The (x) are letters which must be solved in the following riddle
The (0) is a number betwen 0 and 9.
Vote and resteem that we can continue the riddles

My first is in medallist but not in demitasse
My second is in periphrastic but not in practise
My third is in starkness but not in easterner