Two Felemental’s on each side of Rylak with a Macaw is the combo. Add in a Rattler to give them each reborn and it gets silly. Find a Brann later on and well you are going to have some obscenely large minions in the tavern by turn 8-9. If you find the room a Titus will overkill the combo. Keep in mind the entire first 3 card combo is ALL tier 3 minions so tripling them up is not difficult at all.
Grab the largest minions as the combo triggers the following turn. Normally it’s demons but could be something else. The demons are best because the feed off the bigger minions you are making. By end game a single Felbat is all you honestly need as the huge minions in the tavern are feeding your in play minions. Ur’zul is awckward to use when you can just have the Felbat end game or up to that point using Mind Muck’s is a better choice for targeted buffing on your demons.
It sounds complicated and should take a while to happen but the Macaw increased the speed of the build greatly.