Multicolored cards of exactly two colors now have distinctive looks, lands that produce one or two colors of mana have piping to remind you what color they produce, and Ravnica introduced things like guild watermarks
We all know that sometimes its really hard to get the cards that you want without wildcards
There are plenty of good ways to deal with creatures, so as long as you save them for the right targets, it is mostly about small edges, synergy, using your cards at the right time, a timely combat trick or double-block, and executing your archetypes game plan correctly
Their top priority is to stop the opponent from executing his or her game plan
Sometimes bouncing a key permanent can deny your opponents a fantastic turn, even prevent them from winning