Let your words crackle and sparkle. Consider your patter outstanding if it can stand alone. That is, if you can deliver the spoken part of your act and entertain the audience even without the magic part, then you have a killer patter. Aspire to have such quality patter.
Easier said than done, though. Most beginning magicians think all they need to say while performing is to describe what they are doing. Something like this: “I now shuffle the cards, cut the deck a few times, and cover it with a red silk handkerchief. I wave my hands like this (he does) snap my fingers (he does)…and blow (he does that too)…and your card disappears from the deck and finds its way into my pocket (he points to his pocket).
Are you using this literal patter as if you are describing your act to a blind audience?
In case you didn’t notice, that kind of patter is boring.
You can do better than that. Even if you are the most inarticulate person on earth, surely you can do better than describing your act to an audience who sees what you are doing.
Of course, a descriptive patter has a place in a magic act. If you want to emphasize something, you may need to point it out (by describing it) to increase the impact of the magical effect.
For example, just before you change the color of your tie you say, “Look, my tie is red.” You say this to make sure the audience is watching and noticing that the tie is red. When the color change does occur, it becomes more astonishing, because you have controlled the audience’s attention with your patter.