Scrying Sheets

{T}: Add {C}.
{1}{S}, {T}: Look at the top card of your library. If that card is snow, you may reveal it and put it into your hand. ({S} can be paid with one mana from a snow source.)

The List

Coldsnap

{T}: Add {1} to your mana pool.
{1}{S}, {T}: Look at the top card of your library. If that card is snow, you may reveal it and put it into your hand. ({S} can be paid with one mana from a snow permanent.)

If the card isn’t snow, you can’t reveal it. If the card is snow, you don’t have to reveal it. An unrevealed card stays on top of your library.