They "remember" any counters they had on them, any choices made when they first came into play, and whether they were tapped or untapped when they left play
This also makes Assassin Commander decks more and more competitive, with unique combos and win effects
But its good to start tuning your ear for the names of different steps and phases so you can build that understanding as you get more comfortable with Magic
With Graveyard Trespasser, Teachings of the Kirin, and Lord Skitter, Sewer King, you can reliably banish those cards from the graveyard and ensure that your opponent has no way to regain their lost tools
Golgari access is what makes Lathril one of the best Elf commanders in MTG with tools mono-green decks cant touch
If you choose all modes, you set yourself behind as well, giving everyone a chance to rebuild before you