Carcosa, The Shrouded Citadel

Carcosa, The Shrouded Citadel comes into play
tapped
{t}: add {u}, {b}, or {r}
{x}{x}{b}, {t}, Sacrifice Carcosa, The Shrouded
Citadel: Search your library for up to one Horror
card with mana value X or less and put it onto
the battlefield tapped with X +1/+1 counters on
it, then shuffle your library.