Having flash is nice because you can wait most of the early turn cycle without exposing Archivst of Oghma to targeted removal
It plays slow, and giving your opponent more cards isnt ideal
Powerful cards youre looking for here are Skyclave Apparition, Emeria's Call, Omnath, Locus of Creation, and the cycle of Pathways
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Another big part of the story is Pioneer
However, Commander games can be pretty long and require a lot of planning to arrange and then a lot of effort to play, so cards destroy all lands in play like Armageddon, Devastation, and Ravages of War can be extremely frustrating to play against if no one can counter them