The Toolbox: Acidic Slime, Bane of Progress, Mulldrifter, Prime Speaker Zegana, Scourge of Fleets, Soul of the Harvest, Whiptongue Hydra While there are likely dozens of acceptable choices for utility creatures, I believe these seven serve the purpose of supplying us with ample card draw and removal attached to bodies
The face commander, Eowyn, Shieldmaiden, creates two 2/2 human creature tokens (at the beginning of combat on your turn) if another human has entered the battlefield
Sol Ring Playing a turn-1 Sol Ring in Commander usually means you become an instant target for ramping so quickly
Attrition and Vampiric Rites let us sacrifice creatures to draw cards or destroy another creature
While Mega Gardevoir ex could end up becoming somewhat popular, I doubt it will have the same dominance as Gardevoir ex did
Wasteland is a defining card in Legacy because its incredibly powerful