This means these legendary creatures cant be your commander : Emrakul, The Aeons Torn Erayo, Soratami Ascendant Golos, Tireless Pilgrim Griselbrand Iona, Shield Of Emeria Leovold, Emissary Of Trest Lutri, The Spellchaster Nadu, Winged Wisdom Rofellos, Llanowar Emissary You also cant play any card with a silver border or acorn stamp as your commander
The other parts you need are simply a zero-cost sacrifice outlet and some effect that can place a +1/+1 counter on creatures as they enter the battlefield: Grumgully, Path of Discovery, Juniper Order Ranger, or Rhythm of the Wild for example
BPhillipYork: Well additional lands are nice but for Commander I never really like "do a bunch of things in one turn" unless it wins the game
Cloud, Midgar Mercenary I would rank Cloud, Midgar Mercenary higher if it gave you more additional triggers for more than itself