Ralla, Queen of the Cold

Vigilance, First Strike
When Ralla enters the battlefield, put two 3/3 Ice Bear tokens onto your side of the battlefield.
{t}{u} Ice bears under your control gain +2/2 and Trample until the end of your turn.
{t}{x}Target opponent sacrifices creature with converted mana cost X, Ice bears under your control gain vigilance until end of turn.
Winter comes with her