Since you don't have the means to give him vigilance, your deck lacks any other defensive measures (so right now, all you can try to do is outpace your opponents and hope their decks don't have any creature removal to get rid of Blanka)
The ceiling is incredibly high for Huatli because of the power of the ultimate and the ability to gain obscene amounts of loyalty, but the floor is also incredibly low as Huatli can do actual nothing for four mana
Out In Other Suggestions Many cards were left aside to maintain the integrity of the created deck, so I have some additional suggestions for the future development of your deck
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(Until there are enough options for a high-density of solid sacrifice outlets in Temur colors, I wouldnt go all in on that plan, but the one-off is a nice option that synergizes with the rest of the deck.) There are a lot of creatures with great abilities for +1/+1 counters, and we also just want back-up options in case casting our commander becomes difficult
Each region of the game world has its own rules variants, so playing in Balamb, where the game starts, is slightly different than playing in places you visit later on