You really want to be curving out with early merfolk to ensure theres already an army ready when Hakbal arrives, and as a four-mana commander, you dont really benefit by ramping into him after turn two

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Augur of the Leyline, answered What is Augur of the Leyline
Wizards of the Coast teases that there are at least a few exciting details that havent yet been revealed
The ease that this card creates has led it to be banned in several formats, including Commander, though you can still play it in Oathbreaker
All of this makes the extra mana or two that each aspect of the card requires worth it