Ryx, Lord of the Undead Legion

When Ryx, Lord of the Undead Legion enters the battlefield, search your library for up to three Skeleton creature cards with converted mana cost 3 or less, put them on to the battlefield, then shuffle your library.
{u}{b}{r}{g}: create X 1/1 black Skeleton creature tokens, where X is the number of Skeleton creatures you control.
"They arise. You fall."