That House on the Hill

Whenever a Spirit creature you control deals
combat damage to a player, you may exile that
Spirit and shuffle an event named Boo! in your library that when drawn lets you cast a Spirit
card you control from exile until end of turn.
Whenever a Spirit creature you control is exiled,
put a Spirit creature onto the battlefield from
your library with converted mana cost equal to 1
plus the exiled creature's converted mana cost or
less. Shuffle your library.