ye pugna is pretty sick counter to him, only game i lost to skywrath was the one they insta locked pugna and him, decrypify + good ult hit is crazy damage. on the other hand its a dot aoe, with shared damage, so like if 5 get cought in magnus ult , or vacuum + aoe stun and then skywrath ult, shared damage is 240 per player

, also forcestaff is a great counter.