Archives Geist

Coalesce (When you cast this spell, you may sacrifice
any number of spirit you control. This spell cost
{1} less to cast for each spirit sacrificed this way.)
When Archives Geist enter the battlefield, you
may search your library for an instant, sorcery or
spirit card, reveal it and put it into your hand.
Then shuffle your library.
"It takes more than a lifetime to memorize the contents
of the archives."