Ashe, The Frost Archer

Partner with Sejuani, The Winter's Wrath (When
this creature enters the battlefield, target player may
put Sejuani into their hand from their library, then
shuffle.)
Reach
{w}{u}: Tap target creature you don't control. That
creature doesn't untap during its controllers next
untap step.
{u}{g}: Look at the top card of target players
library.