Nathan, Dragon of Winter

Flying, haste
{1}{u}{r}: Nathan, Dragon of Winter deals 3 damage to target creature. Draw a card.
Winters Grasp- At the beginning of your end step, you may pay {x}{u}{r}. If you do, tap up to X target permanents and exile X target tapped nonland permanents. Each opponent may draw a card for each permanent he or she controlled exiled this way.