Phelia, Exuberant Shepherd is a cute doggo that can exile a creature and then make it return to the battlefield at the start of each combat
The green based decks don't really need these but the rest find them all sorts of lovely
Neriv, Crackling Vanguard points in a very different direction, scaling up with the number of differently named tokens you control, kind of like Gimbal, Goblin Prodigy
It's a staple top-end card for Green ramp decks for a reason, and is even better when you can blink it over and over again with a Roon of the Hidden Realm
I'll start with Urza's Saga and then walk through each set with cycling cards and explain what design advances they had to offer
But it still suffers some from the drags of multiplayer, in particular still being very, very political or maybe thats still benefiting from the joys of being very political, depending on your point of view