For example, as of December 2013, the cards in your standard deck have to be from either Theros, M14, or Dragons Maze
If you one day pull an exceptional card in near-perfect condition, you will know the option is there
A lot of that is thanks to Zurgo Stormrender, a three-mana creature that creates tokens but lets you either draw cards or drain your opponents whenever a creature token you control leaves the battlefield
Oftentimes, two or three specific cards working in conjunction are enough to win the game on the spot
These cards are banned in every format, and not allowed in any sanctioned tournament play under any circumstance
and so was Thrashing Wumpus