For the deck looks like a lot of fun, don't have four morning glories but will try it when I do.
You can replace 4 Morning Glories and 3 Animates with basically anything and still make the deck work brilliantly. Just try to stick with offense, unless you want to change the theme of the deck, too. You can throw in a few extra
pillars, a Miracle or two if you have them, more Pegasi, some Dragons... those 7 cards are the most replaceable cards in the deck, to be honest.