"Mill" is a colloquial term that originates from the card Millstone, used here to mean "putting the top cards of a player's library into his or her graveyard." For example, you could say, "In the finals of the Pro Tour Qualifier, Herbert cast Tome Scour to mill away my final five cards, dashing my chances of playing on the Pro Tour." There are many players who will play with Tome Scour in their decks
If a targeted player has only one card in hand as Kozilek's triggered ability resolves, they manifest that card
Trading Card Game and then Magic: The Gathering
However, changes and innovations are happening rapidly, and previous decks that got no recognition are now considered among the best Lorcana decks right now
While some old favorites are leaving the standard format, it's clear that Scarlet and Violet is bringing plenty of new powerhouses to replace them