At the beginning of your end step, mill seven cards. Then return a card at random from your graveyard to your hand.
Whenever chaos ensues, return target card from your graveyard to your hand.
Nephalia’s first ability doesn’t target any card, and players don’t get priority to cast spells or activate abilities in between putting cards into your graveyard and choosing a card to return.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.