The ability to trade a few life or an early creature for card advantage can easily swing game momentum in your favor
For the most part, though, any mechanic can be good if its paired with the right strategy
The most obvious changes were the card borders, but the font was also changed (from Goudy Medieval to Matrix Bold) and mana symbols in the text box were no longer colored (however this latter change did not last long, and was changed in Kamigawa Block)
Its seen play in Modern, but Delighted Halfling impresses me most in Commander
Never use cheats that modify the games booting sequence or write to protected memory addresses
The Best Knight Payoffs Virtue, loyalty and chivalry are your payoffs for playing knights, and made evident by Virtue of Loyalty, The Circle of Loyalty, and Chivalric Alliance