Nyx Avatar

When you cast Nyx Avatar, exile all creatures
with converted mana cost five or less.
Flying, lifelink, indestructible
{8}{w}{u}{b}{r}{g}: Search your library for any
number of spells with total converted mana cost
13 or less and exile them, then shuffle your library.
For as long as you control Nyx Avatar you may
cast those spells without paying their mana costs.