Never done this...though I have 3 cards currently, Saph Pref, Freedom, SPG, all personal cards. 740 score and I am thinking of this... Hyatt United Explorer BA Club Carlson Citi Hilton Should I apply for them in one day? Should I not apply for one/some of them for any particular reason? I am Hyatt Diamond and I have a 50k United offer waiting for me right now in my email. CC will be nice for a potential Europe trip coming up and I might switch from Hyatt to Hilton in the intermediate term (Hyatt Diamond and SPG Platinum thinking of going SPG Plat, Hilton Diamond on Spend, Kimpton Inner Circle). Any help would be great.