Trying to keep pace with a Hierarch when playing a highly aggressive deck is a head slumping experience, and due to the lack of competition most decks with access to the colored mana would choose this over other creatures in the same price range
A few tech cards and a new approach makes Carrascos Deck a whole new type of threat
"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
Birgis a mana-making machine and contributes to several infinite combos, whereas Harnfel, Horn of Bounty makes sure youre never drawing dead and plays well with paradox commanders like Faldorn, Dread Wolf Herald
However, there are those who say (and here it may be a majority opinion) that the effort is not worth it, as the prize pool at the end of the season can be mediocre compared to the time dedicated to staying in the Mythic and, even so, being in the Mythic you may not be ranked high enough to be invited to an event