Plead at the Source

This spell costs {r} less to cast for each basic Mountain you control.
If you control seven or more basic Mountains,
you may cast this spell as though it had flash.
Players can't win or lose the game this turn.
Draw cards equal to the number of cards in
your library. Plead at the Source deals damage
to you equal to the number of cards in your
hand. Exile Plead at the Source.