Lazotep Archway [Mystery Booster 2 Playtest Cards]

Lazotep Archway enters the battlefield tapped.
T: Add W or B.
Eternalize 3WB (3WB: Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie creature and loses all other card types. Eternalize only as a sorcery. And don't forget it still enters tapped!)