T'Lol the Barren

Whenever one or more lands are placed into graveyards, create an X/X blue Illusion creature
token with Vigilance and Skulk, and "When this creature becomes the target of a spell or ability, sacrifice it." X is the number of lands with
different names in all graveyards.
Illusions you control have "If this creature would
deal combat damage to a player, instead that
player mills that many cards."