Because the goal is to spend less time doing arts-and-crafts and more time actually playing
I think most players will sniff out the duplicity of the Breena player too easily and will try to remove her like any other Aggro deck
You can find instructions to see the cards I made on MPC Fill at the end of this article
4 Team Rocket's Mewtwo ex Makes Use of Energy on Board Card Number: 231/182 Discarding energy to deal bonus damage has become commonplace in the current format, and some of the best decks can do this efficiently every turn, so they can quickly win a match
From top-decking a single four-mana aura, you might suddenly conjure up a massive giga-threat with all your enchantments on it then when it dies, do all that again
There's no "Mine" mechanic but there is Descend, which triggers various effects when you discard to the graveyard, and Discover, which lets you flip cards from your deck into exile until you find something with a set mana value that you then either cast or put into your hand