Hellborn Birthing Pit

{p/b}{t} Sacrifice a creature: Search your library
for a creature card with mana value equal to 1
plus the sacrificed creature's mana value, put
that card onto the battlefield, then shuffle.
Activate only as a sorcery.
If creature placed on the battlefield with this
effect has a mana value of 6 or greater, create a
2/3 red Demon Berserker token with Menace.