Fast rabbit (used a mountain cottontail with 341 speed) to smash undeads and avoid avoid avoid!, Wolvar pup to counter beasts and dragons and Lil' Ragnaros to counter the various mechs, complete with avoidance and stuns.
Rabbit usually started vs the likely Val'kyr/Crate/etc, totally negating the grip-swap/haunt tactics, and a fair few people would chicken out at this point and flee! If they did decide to stay, they would get chewed to bits by TEH BUNNEH OF TEH DOOMZ, and the last two would use the stun abilities they both have, combined with big hits to clean up.
Sounds dull, but it got to a point that I was seeing people flee as soon as they saw my team, and was racking up the wins at a good pace, losing only 2-3 in ten games or so
![Smile :)](./images/smilies/icon_e_smile.gif)
Everyone has their own ideal team, but this one worked for me, and as soon as I got my 5k wins, that was me done!
GL and have fun!