Theoden, King

Cavalry (this has Haste and Vigilance as
long as you control another creature with Cavalry.)
{w}{w}, {t}: You may reveal the top X cards of
your library, where X is the number of creatures
your opponents control. If X is greater than 10,
you may cast any Riders among the revealed
cards without paying their mana costs. Put
any Riders not cast this way into your hand,
and the rest on the bottom of your library
in a random order.