On of my frequent opponent runs Grey Knights with Ultramarine allies.
His main death unit is Draigo, GK Librarian, Tigurius, and 3+ Centurians
Most of the time Tigurius has invisibility so that power will go off most of the time, then using Gate of Infinity to deep strike around the board.
Turn one he puts that unit as far away as possible or out of line of sight.
So far my strategy is to stay 30+ inches away and try to stop Gate with DtW rolls since my opponent will usually only put 2-3 dice towards that power and 4-6 on invis
On the off chance that Invis fails I put all fire into that unit that I can, but outside of that I don't have a great solution to combating that type of unit.
I've tried throwing markerlights at it but I'm lucky if I get 1 or 2 to stick which only helps out one other unit, I still can't drop a large blast since all things are snap firing. Most of my units are too few of shots (fusion or other AP1-2) to maybe take 1 or 2 models out if I'm lucky or allows his 2+ armor save to be taken.
You can't tie the unit in assault because Gate allows him to jump away, and Tau vs Draigo is fight I want to be in.
Does anyone have any other ideas or strategies?