Note that the damage he deals is not red but the color of the dork that smashed their owner, so it's direct damage from a red deck that may avoid some versions of damage reduction
Evolving Swablu into Mega Altaria gives you a durable win condition that hits for solid damage while being difficult to one shot, which matters a lot in a format defined by burst damage
Regrettably, Tithe is on the Reserved List, so it is ridiculously expensive for the effect you get, but if you want an inexpensive alternative that is slightly watered down, Gift of Estates plays reasonably well, trading instant speed and doubling its mana cost for a guaranteed 3 plains cards
For example, you might have a Goblin tribal deck or a Beast tribal deck
We'll also be getting multicolor lands to help make whatever deck you throw together work
But for older formats, where the bar for successful aggression raises exponentially, we are forced to likewise look for more exponential forms of TAUC payoff