Since the list is packed with stall options, we can halt the opponent's attacks and focus on hitting the opponent's Leader, trying to win the game quickly
Artifacts make most decks work
Then, once its out, each time its user casts a spell, they can bounce back either a spell on the stack or a nonland permanent on the field back to its owners hand, turning every spell they have into a counterspell and allowing them to clear the field for a game-winning all-out attack, or even removing curses and other effects from their own permanents
Magic: The Gathering is the first modern collectible card game
What this means is if the player isn't playing red or green, he or she won't play this mechanic
Obviously, the game is a giant success and a lot of that is directly attributed to the core of the game design