The other formats

Hi guys,
I've been playing with Forge for some time now, 99,9% of it in Quest Mode.
I've tried to do other things but something eludes me.
I'm looking for a bit of insight about the other formats like Commander, Planechase, Cube.
I would like to learn about them, but how am I supposed to use them in Forge?
I mean in Quest mode you have your deck and diverse opponents, you acquire new cards and all. Pretty straightforward.
But suppose I want to try Commander. I have to build a deck and then use it in single, isolated matches against the AI, right? Are there pre-built opponents or, I mean, decks?
What about Planechase and Cube?
Any help about what's what (from other users, no need to waste the developers' precious time
) would be much appreciated 
I've been playing with Forge for some time now, 99,9% of it in Quest Mode.
I've tried to do other things but something eludes me.
I'm looking for a bit of insight about the other formats like Commander, Planechase, Cube.
I would like to learn about them, but how am I supposed to use them in Forge?
I mean in Quest mode you have your deck and diverse opponents, you acquire new cards and all. Pretty straightforward.
But suppose I want to try Commander. I have to build a deck and then use it in single, isolated matches against the AI, right? Are there pre-built opponents or, I mean, decks?
What about Planechase and Cube?
Any help about what's what (from other users, no need to waste the developers' precious time

