Kaust, Eyes of the Glade and Yarus, Roar of the Gods can both thrive with a creature like Aschloud Phoenix, as both of them can draw you cards with face-down creatures and turn creatures face up for free
Table of Contents show How Do Summons Work
Sure, a lack of enters ability means it wont make waves at high power levels, but its a great low-powered and budget-friendly alternative to something like Consecrated Sphinx or Rhystic Study
Since you can play it during another players turn and at instant speed, you can catch them by surprise
As an amazing Aristocrat card, Yawgmoth lets you sacrifice creatures, dole out -1/-1 counters to any creature you want, and draw cards
What input did Square Enix have in the actual design of the cards, beyond collaborating on the art