hmm... what cards would u sugguest putting in, or taking out besides the 7 mana costs?
I can't effectively answer that; I do not know your context in you play, what sets you've invested in, and can't determine what the purpose of this deck is past large creatures. You only have two creatures with a converted mana cost less than three, when RU (Red White) would prefer an Average CMC for the creatures less than 3. 4 of
Generator Servant would help out your deck.
Find something for your deck to focus on. Look at the other RU decks in the system, and see what you can build from there.