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
Create two 1/1 red and white Soldier creature tokens with haste that are tapped and attacking
Regrowth allowed you to reuse your restricted cards a little too easily (only got unrestricted recently, 2013!) There had also been a new set released in the meantime: Antiquities
Ayara, First of Locthwain Drain the table while drawing cards
Magic is no exception, and while Jukai Naturalist wont be splitting Commander in two anytime soon, its an incredibly solid addition to any kind of Enchantress or Voltron deck in the format
Marneus is a very interesting and powerful commander, and you can build around it in myriad of ways (pun intended