The Basic rulebook, read it! A lot of basic questions are answered there!
How to autocard :
Type [c]Black Lotus[/c] to get Black Lotus.
Type [c=Black Lotus]The Overpowered One[/c] to get The Overpowered One.
Thought up some other stuff: Colors: you can use any color that you think that walker would use (c'mon, this is casual) For example Ajani doesn't just use white. The character also uses red and green. Don't know what to do about life total and sorins ability :\ Any more ideas?