Curious Ritual

You may play this card only if you control exactly
4 tapped plains and 4 tapped islands.
Search your library for a white spell and exile it.
Search your library for non-land spells with
combined mana cost of the exiled card. Put them
in a Ritual pile face-down. Draw 1 card for each
card in your Ritual pile.
Once during your upkeep you may search your
Ritual pile for one card and put it into your hand.