"Mill Decks", named after the Millstone card in Magic: The Gathering , the codifier of the offensive use of this effect, are decks that specialize in forcing the the opponent to draw over and over again until they run out of cards to draw, losing the game
Even if you're not bluffing countermagic you can put any land into play as a surprise - flash in a Maze of Ith when they attack you, play a Sejiri Steppe or Bojuka Bog as an instant, play Vesuva in response to them blowing up an important land, etc
This was Violet's aim, as she now gets to resolve the [On Deletion] effects of both Necromon and its digivolution cards
In actuality, it's kind of just a tame spell-copying creature, slightly worse than Dualcaster Mage, though legendary and eligible for the command zone
Denoted by a rainbow hexagon, they also have no borders and come in a beautiful "Inkwash Foil
C Common Minar X EARTH Level 3 [ InsectEffect ] ATK 850 DEF 750 When this card is discarded directly from your hand to the Graveyard by an effect of a card controlled by your opponent, inflict 1000 points of damage to your opponent's Life Points