Is there a way to tell the order of your deck?

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Correct me if I'm wrong, but for yours and the opponents graveyards the top left is the first card that entered the graveyard and bottom right is the last card that entered. IDK why I've never noticed that.

I was wondering if it's similar to mulliganing and viewing your deck. I know the deck is random, so the top left is not the first card, but does the mulligans matter as far as deck order.

If you mulligan a card does it go to the bottom of the deck or is it randomly shuffled in? I feel like if it went to the bottom then mulliganing would be more strategic, and I've never mulliganed with that in mind.
 
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