Guild Wars 2

Allows you to benefit from two streamline kit actives.
While you are at it ANET, separate the cooldowns, even if you increase them a lot and individually, just so that there is some form of play to it.

It also allows you to spam the gunk thingy every 2s or so by swapping in and out of mortar. It does however go on cooldown if you proc it with other kits.