Icebreaker was rarely used in crucible when it was a beast. Will have a couple weeks of hype and then will settle into it's designed role as a PVE beast.
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The only reason people used it was because of Bungo's constant ammo economy nerfs. And with the latest batch of nerfs to snipers, I doubt IB will be used by anyone other than people who suck too much to be able to ever get ammo and SuperSweats for a trolol gun. There are too many other better options for PvP to justify constant Icebreaker use.