Artortias, Knight of Sacrifice

Deathtouch, Menace, Hexproof, Indestructible
When Artortias enters the battlefield you may sacrifice X amount of owner's creatures,
Artortias gets +X/+X.
{3}{u}{b}: Sacrifice Artortias, Knight of Sacrifice:
Search your library for 5 black creatures with a
cost of 3 or greater and place them onto the battlefield tapped.