Terrarium of Terror

Nightmares you control have hexproof.
Horrors you control have deathtouch.
Whenever a nightmare or horror enters the battlefield under your control put a terror
counter on Terrarium of Terror.
Unleash Terror-Exile Terrarium of Terror.
Search your deck for a creature whose mana cost
is less than or equal to the amount of terror
counters on Terrarium of Terror.
Put it on the battlefield without paying its
mana cost, it gains deathtouch and hexproof.