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Harbor + viper pretty much a must.
then depending on personal preference, you have 2 init + 1 duelists (no senti), 1 senti + 1 init + 1 duelist, or 1 senti + 2 init with 0 duelist (or maybe 2 duelist + 1 init if you're paper rex)
Personally, I think Harbor viper + kayo, sova and any one of jett/reyna/raze is good.
I'm very excited for what PRX will play. I think they should stick with their harbor viper reyna + flash init template that sections off sites/map area and then double flash through. 5th slot is open to whatever they want, and has so many possibilities.
You could do sage, but it isn't necessary imo. Personally I think everyone is sleeping on geko. With double wall + cove + wingman plant + flashing and aggressive taking of space, you should get very high plant success rate on icebox. PRX already showed they are willing to use gekko on sunset. + gekko flash is very good at revealing positions/handing tight space since u yeet it into the sky and it has wide visibility.
so maybe harbor viper kayo gekko and phoenix. imo movement duelists arent as important on icebox as other maps. so basically triple flash with kayo gekko and phoenix gekko ultimate flash combos.
or yoru, who also has strong flashes. Like i said, that 5th slot provides many posibilities.
It’s not as safe and useful in post plants
Sage wall lasts 40 seconds, which was pretty much the spike countdown, and takes a full vandal mag to break. It’s pretty OP against late retakers.
Harbor cove doesnt last as long and it can be entered and the defuser can be killed in the mean time of planting