On the human side we have:
General Kudro of Drannith a human that buffs other humans and exiles things in graveyards whenever he or another human ETBs (bye bye Uro). Not only that, he also can sacrifice humans to kill big creatures. All in all, a great card and one of the main cards you are looking for when Winota triggers.
Other humans in the deck are 2 copies of Tajic, Legion's Edge, because he makes our other creatures larger over time and protects against Deafening Clarion and Storm's Wrath, a singleton copy of Judith, the Scourge Diva as she pumps the whole team, human or not, and Haktos the Unscarred a great, but tricky card. Haktos is taxing on the mana base and sometimes he just isn't that great. But when he's great, punching an opponent for 6 is no joke.
All the above creatures are legendary humans so I included a playset of General's Enforcer because not only is he aggressively costed (2/3 for 2) but he gives legendary humans indestructible and can make humans by exiling cards in a pinch (bye bye Uro).
The last playset is Tithe Taker. This guy is here for a couple reasons, when he dies his afterlife makes a Spirit token which triggers Winota, Joiner of Forces. Additionally, he makes your opponent's spells and abilities cost more on your turn which helps deal with the Cauldron Familiar and Witch's Oven synergy. Basically, depending on your opponent's deck they want to get rid of him as fast as possible. Not to mention, Deafeaning Clarion is still a card heavily played, so when they sweep, we lose our Tithe Taker but get a Spirit and hopefully get to cast and use Winota, Joiner of Forces's ability on the next turn or the turn after that.