For example, here are some of the earliest: Auriok Steelshaper was a generic 1/1 for 2 mana on its own, and if it was equipped, only Soldiers and Knights would get a bonus, and it was just +1/+1
The creature card you return from your graveyard with Scavenger's Talent's level 3 class ability may be one of the nonland permanents you sacrificed
As if that wasnt enough, it's uncounterable and also allows Commander players to choose a Background, which makes this erudite ursine a flexible and fun option to lead your 98 in a Bear-themed deck
While those creatures cant attack straight away, because you tapped them, it allows for a potentially game-winning attack the next turn
Left unchecked, Archmage completely overwhelms opponents by generating unstoppable card advantage
Y'shtola also synergizes well with common Black and White deck themes that focus on dealing small damage and healing outside of the player's combat