Mid-century style, very stylized
While egregious play patterns was the primary reason for the bans, the card was also incredibly hard to find, and at one point during its time in Standard, was regarded as the card with the lowest supply, relative to the rest of the formats card pool
You also get opportunities for weird ability overlaps where the changelings can utilize different typal buffs at the same time
Barrowin of Clan Undurr gives you a free venture into the Dungeon when it enters the battlefield
Preston, the Vanisher Preston, the Vanisher is an instant blink-deck classic
(Though, if you have enough mana fixing, you could maybe splash for a third color if you wanted.) But if you want to shop around to other colors (what's more Dimir than having a Dimir deck box when you're actually playing Selesnya, I suppose?), things that may draw you into specific colors are: A really strong rare you're excited about