Endless Nightmare

Deathtouch
When Endless Nightmare dies, you may pay {b} to put a 1/1 black Horror creature token with deathtouch and "When this creature dies, you
may pay {b} to put a 1/1 black Horror creature
token with deathtouch and "When this
creature dies, you may pay {b} to put a 1/1 black
Horror creature token with deathtouch and... " (Repeat this effect indefinitely.)