Moonlight Alchemist

When Moonlight Alchemist enters the battlefield, reveal the top card of your library, then you may discard a card. If you discarded a card that shares a card type with the revealed card, put that card into your hand.
The Thoughtcastle is known for existing in an extremely cold environment already, and going farther north only gets worse, but at a certain point the freezing temperatures vanish and leave only a perpetual night sky.