The vayneee.. oh my lord!!
yeah it was me and poppy vs soroka and vayne. we ended up getting a kill on vayne before the minions even engaged on each other, and eventually we were destroying them so badly that i just started diving into the tower and tanking the turret for kills on them. i only had 2 kills, which were both 1v1s, but i made an effort not to get any kills because i wanted to feed poppy until she could instantly kill someone inside of my stunlocks. i didnt even die a single time until the team fight phase and by then they were focusing me and poppy extremely hard so we ended up getting killed a bunch near the end when we'd all get simultaneously ult'd
but seriously, at level one Zenith Blade into Poppy's wall slam stun with ignite and exhaust right after and you pretty much guarantee a kill at level 1 against squishy targets like vayne.