With its introduction in Adventures in the Forgotten Realms it became a black-bordered mechanic
Stealing Hangarback Walker is particularly awesome (but be careful not to flip Jace, Vryns Prodigy if you steal him)
Haste gives you an extra attack with her, vigilance keeps her back so the first strike and protection can work to keep people from attacking, and trample will smash through any measly defense you might have otherwise mustered
// Lifelink Protect Whenever Cecil attacks, other attacking creatures gain indestructible until end of turn
Also, as head designer Mark Rosewater once noted, the Ravnica: City of Guilds set was the first to make in-game factions highly cohesive and distinct thanks to their official names, watermarks on cards, and many cycles
In a Vannifar deck something like turn one mana dork into turn two Tyvar into turn three Vannifar is a deterministic win with Prime Speaker Vannifar tutoring up a deadly chain of creatures