Any card that lets you give control of that permanent to an opponent or force them to make a copy of it puts them under an alternate loss condition, which is a roundabout way to win the game
New expansions and updates are available instantly for those who choose to spend money
Use Market Analysis Tools The best price checkers do more than just tell you what a card is worth todaythey show you its price history
Urborg & Yavimaya Urborg, Tomb of Yawgmoth and Yavimaya, Cradle of Growth are both very good for mana fixing in multicolor decks including either black or green
Two Invisible Wires kill 2000 or lower attackers, two Acid Trap Holes kill 3000 or lower, a Widespread Ruin kills anything, and a Torrential Tribute kills everything
It also plays nicely with keywords like lifelink and deathtouch since your commander deals damage and you still get a good combat step since your creatures deal damage