there\\\'s a poltergeist in the library!!

Whenever a creature enters, that creature's controller may have it deal damage equal to its power to any target of their choice.

, Sacrifice this artifact: Add three mana of any one color.

This spell can't be countered. When you cast this spell, take an extra turn after this one. Flying, protection from spells that are one or more colors, annihilator 6 When Emrakul is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.

Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

(: Add .)