First off, Seism is already a False God, but i guess the name could stay if he got it, so he'd be like Miracle. Tsunami is a weapon name, so that probably won't work. The concept seems good, but 5 damage is a bit much, because most earth or water decks don't use other elements (poison doesn't actually use any death creatures).
Pitfall looks nice as well, but the programming would presumably be hard, as the creature would get the unburrow ability and then it would change back after being used.
What would be really fun with surprise is targeting your opponents oty and making him eat his own creatures (shame it can't eat itself). That would present a lot of problems.