Trana, Winters Champion

Each player plays with the top card of their
library revealed.
Opponents with the same card type revealed as
you can't attack you.
{4}{w}{u}: Draw a card, then put a card from your
hand on top of your library. Create X 1/1 white
Knight creature tokens where X is the converted
mana cost of the top card of your library. Activate
this ability only once and only on your turn.