Minamo Scrollkeeper

• WOTC Official Reminder Textofficial rules
  Defender — This creature can't attack.

• WWizards of the Coast2013-04-15
  Official Ruling
  If multiple effects modify your hand size, apply them in timestamp order. For example, if you put Null Profusion (an enchantment that says your maximum hand size is two) onto the battlefield and then put Minamo Scrollkeeper onto the battlefield, your maximum hand size will be three. However, if those permanents entered the battlefield in the opposite order, your maximum hand size would be two.

Rulings via Scryfall