Katarina, Consul of Havenheim

At the end of your turn, scry X where X is the number of creatures an opponent controls.
At the beginning of each opponent's turn, you may untap each creature you control with power 3 or less.
{t}: Reveal the top card of your library, if that card is a instant or sorcery with converted mana cost 3 or less, you may cast it without paying its mana cost.