Lolth, Orzhov soulcrafter

Extort
Whenever a spirit creature enters the battlefield under your control, search your library for an artifact with converted mana cost X, where X is that creature's toughness, and put it onto the battlefield tapped. If that artifact is an equipment, equip it to Lolth. If it isn't an equipment, it becomes an X/X artifact creature, where x is its converted mana cost.