Starring as the main commander is the duo of Shiko and Narset, Unified, coming with the new Jeskai-specific ability flurry, letting you copy your second spell each turn so long as that spell targets a permanent or player
If these are a little beyond your budget, you may be able to actually afford some expensive basics, perhaps
It has several tutorials that will show you how to play in a practical way, each one more complex than the previous one
On the other hand, heading toward Boros Aggro comes with an upside and a downside
With the "Bystials" providing extra consistency boost by searching and/or summoning various easy-to-summon Dragon monsters as well as providing various form of interruption, whereas "Chaos" support aims to exploit both the banishment effect of the "Bystial" and the large number of DARK monsters to further boost the consistency
The artwork may not have the same instant monster-recognition factor as the biggest boss monsters on this list, but the overall package still works extremely well