hmm

Clash of Dragons and Undeads
Trap Card
This card can only be activated if you control a face-up level/rank 7 or higher Dragon-type or Zombie-type(printed) monster. Activate one of the following effects:
-Dragon: Reveal the top 5 cards of your deck. for every Dragon-type monster revealed, inflict 500 damage to your opponent. If you control 2 or more dragon-type monsters, you can special summon 1 level 4 or lower dragin-type monster from your deck.
-Zombie: Send 3 Zombie-type monsters from your deck to the graveyard. If you have 12 or more monsters in your graveyard, you can banish 3 of them to destroy 2 cards on the field.

So, all you have to do is use Lichwyrm, Harbinger of Blight for both effects to work?

that is.....kinda the point. so yeah.