Gandalf, Grey Pilgrim

When Gandalf enters the battlefield, search your library for a legendary card, reveal it, then shuffle
your library and put that card on top.
Fellowship - If you control another legendary creature, Gandalf gains 'When Gandalf dies, you
may put it on top of your library instead.'
At the beginning of your upkeep, if you control 3
or more other legendary permanents, transform Gandalf.