The Unstoppable Tide of Ajani (Oathbreaker)

It's amazing the amount of synergy Ajani, the Greathearted opens up for us, which is why this is my favourite Oathbreaker right now. (Before I forget, let's remember to celebrate his definitely-canonical marriage to Zedruu the Greathearted. Congrats, you two.)

He allows us to go wide with a huge tokens army while he boosts them up periodically. His static ability gives them Vigilance means we can attack our opponent and convoke with those same creatures in the same turn to create more tokens with March of the Multitudes, our signature spell. Some other creatures come with their own squads such as Captain of the Watch and Leonin Warleader, while Hornet Nest is our own name-brand pinata to keep the party going.
We've also done our duty to mandatorily include Anointed Procession to abuse this combo even further. It wouldn't be a tokens deck without it.

We've also included a package of Proliferate cards to drive home our +1/+1 counters advantage after we -2 Ajani with cards such as Karn's Bastion and Pollenbright Druid and Huatli's Raptor. This is, admittedly, a secondary feature, but it should not be underestimated. To help buff our team with those counters we also have Abzan Falconer to send our team skyward and Ainok Bond-Kin to make sure we stand strong together in combat.

If your group doesn't appreciate my memeing, you can remove Earl of Squirrel for another synergistic card such as Bloom Hulk, but I've always wanted to have an army of squirrels, so I'm keeping him in.