which are good lane combos for getting early kills?

Bane Mirana is awesome.

Shadow Shaman, Lion, and Mirana would be a dream.

Rubick, AA, and a carry with a stun would be pretty good.

Storm Spirit and Clockwerk.. I did not liked the day when I faced them on dual lane.

The offlane nightmare:
Trilane including Jakiro, Skywrath and a Carry with stun or slow.

Why have it as a tri-lane? Jakiro and Skywrath can zone out basically any solo off-lane Hero between Liquid Fire and Skywrath Mage.

Jakiro can technically play a core role, since Liquid Fire lets you push down towers extremely quickly, and if Jakiro can farm an early Mekansm (Which as a core potentially free farming he is capable of doing so), the you can keep pushing down towers again and again and have all outer tier towers off of the map by less than 20 minutes.

You can run it as a Tri-lane for sure, but you don't need to. You can run a heavily focused Roaming support like Mirana, or a Jungler like Enigma and take advantage of the fact you should be winning that lane outright.