The Haunting of the Horrors

I & II - Reveal cards from the top of your library until you reveal a non-Horror card.
Then put all cards revealed this way into
your hand.
III - Horrors you control get +1/+1 and gain trample and infect until end of turn. (They deal damage to creatures in the form of -1/-1 counters
and to players in the form of poison counters.)