Also looking at your mardu deck your curve seems a little hefty and if you're okay with that i still suggest only 1 of blademaster and captain. Mana base seems a little janky. i did have munda in mine for awhile but it did hurt the curve but if you want a more late game deck you're just fine. also not taking advantage of
kalastria healer seems strange. it creates pressure on the board just by existing and helps get damage in and make it to where playing almost anything in your deck is a threat and cause your opponent to use up their removal. also your removal seems off.
Roil's Retribution is just bad. if you're going to have a late game deck it's better to have more removal to kill their bombs and when you only have 4 copies of removal, 2 3-drop, and 2 5-drop, you're asking for trouble. my deck does have only 4 copies of removal but it's better removal and i plan to hit harder and faster than you, which isnt bad, you just have to adjust for a more midrange-end game deck.