Scribe of Unwritten Laws

Predominate X, where X equals your devotion to
blue. - {u} (Whenever you add {u} from a nonland
source, This creature gets +X/+0 and gains hexproof
until end of turn.)
Creatures can't attack you or Planeswalkers you
control unless their controller pays {x} where X is
Scribe of Unwritten Laws's power.
Permanents and spells you control can't be the
targets of spells or abilities your opponents
control unless that opponent pays {x} where X is
Scribe of Unwritten Laws's power.