Synth Waters

{1}: Pick any mana color and change this card
to that land for the rest of the game. This effect
is not classified as a spell, and the card now
plays like normal Land. The only way to revert
this action is to discard the top 15 cards from
your library. If you have no cards left, you may
shuffle your graveyard into your library.
DO NOT include lands or anything
that has toughness 4. If you still have cards,
exile this card.