These are the heavy hitters of Magic, and all of them have extensive tribal cards to support them
A 3-mana engine that pumps out two pieces of sacrifice fodder a turn is an excellent rate
(They can attack and as soon as they come under your control.) Whenever Shadowfax attacks, you may put a creature card with lesser power from your hand onto the battlefield tapped and attacking
Ilharg, the Raze-Boar and God-Eternal Bontu are creatures that get sent back to a known position in your deck, so Im pretty sure you can generate some nice synergy lines that way
In Modern specifically, it still sees only moderate play compared to how many decks could truly play it, which is mainly a reason for Jeskai not being super popular right now
Even out of the box though, Bellos deck is very cute and pretty powerful, so that might be worth the price of entry alone