The dividing lines between brackets 1 & 2 or brackets 4 & 5 are drawn based on arbitrary judgments like prioritizing theme over function
The fact that you can cast Tiamat with this in play and put five dragons on the table is very interesting and splashy, but in competitive MTG, this spells win more. Either way, this card can create loops when you cast a dragon again and again for free, but youre either cheating Dracogenesis into play or dumping 8 mana into it Omniscience is already a thing, by the way
You can use Oviyas passive ability to incentivize your opponents to attack each other, and you can make sure they have the creatures to do so by dropping Hunted Wumpus and Iwamori of the Open Fist
Piper of the Swarm has a low casting cost, making it very easy to give all your Rats menace
Despite being legal as a one-of, they actually did not play Mind Twist, preferring instead to Black Vise people to death