Royal Archives

Catalogue X, where X is the number of creatures
you control. (As this enters the library zone,
put the top X cards of a library you own face up on
top of this card as a new library. As this becomes
empty, put it into its owner's graveyard.)
You may cast the top card of this library and you
may cast it as though it had convoke.
{w}{u}: Shuffle this library.