Angel of Silent Horizons

Flying, vigilance
At the beginning of your upkeep, you may have
any number of permanents you control enter or
leave orbit. (Permanents in orbit can't attack and
have protection from non-orbiting sources. If a source
would cause both orbiting and non-orbiting permanents
a player controls to leave the battlefield, that source's controller must choose for either the orbiting
permanents or the non-orbiting permanents that player controls to leave the battlefield instead.)