You want to try and maximize Mayael, and make sure that when you activate the ability, you NEVER come up short. I would try and replace your creatures with less than five power with some larger ones, so you can ensure that you are always getting the best of your commander. There are also a few instants that I would cut for ramp, removal, or just MORE creatures. Changes: (not all of them)
Plea for Guidance : Replace with a big creature
Hope that helps!
You need to add more creatures that Mayael can hit for her to be an effective commander. Try out cards like It That Betrays or Windbrisk Raptor for some good fat creatures. You usually want 23 or so creatures in the deck that mayael can hit for her to be consistent. Also Quicksilver Amulet is excellent to get rid of the large creatures in your hand. Hope that helps!