Uizaya, God of the Lost

Indestructible
Uizaya isn't a creature unless you control five or
more other artifacts.
Whenever you cast an Artifact spell, create a
Treasure token.
{1}{u}{u}, Sacrifice five Treasure tokens: Search
your library for a card and put it into your hand.
Then shuffle your library.
"Treasure only has as much value as we give it."