"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 the targeted spell was not kicked, then the copy will not be kicked
For the Collectors Weve seen market fatigue recently with serialized cards, so WotC pivoted
But what does this term mean and how can you tell if your card is Shadowless
Daniel: Naturally high mana values mean hitting land drops, ramp, and early game are all pivotal to staying in the game, otherwise more aggressive decks can run you over