The Nameless Gloom

When this creature enters the battlefield, each
player creates three 1/1 green Elf Druid creature
tokens with "{t}: Add {g}."
At the beginning of your upkeep, sacrifice
another creature you control, if you don't, tap
The Nameless Gloom.
The Nameless Gloom can't be blocked except by creatures with "{t}: Add {g}."