Lady Avelaide

{w}{u}{b}{r}{g},{t}: Search your library for a land, an artifact, a creature and an enchantment, reveal them and put them into your hand, then shuffle.
Return Lady Avelaide to the command zone.
When Lady Avelaide is put into the command zone for the third time, remove it from the game then search the library or from outside the game
for another legendary creature and put it into the command zone as your new commander.