You counter raum with your high sustain and cripple.
Tips:
Keep medium range
If Raum Ășlts:
use obliterate or ult to counter
If he runs you can cripple him w/5stackDS
Drogoz does counter you with verticality and damage but you can get him on the ground with cripple long enough to obliterate him. Also you can use tendril to grapple onto him.