Shock Lands, Hallowed Fountain, Watery Grave, Overgrown Tomb and the rest, do the same job with one small catch, you take two damage on entry unless you let them come in tapped
The most important thing I needed to avoid doing was play a Sengir Vampire, as I couldnt Terror my own Sengir
Maybe its the fact that it has flying, maybe its the fact that it has a thicker booty, I just think this card is so cool
Rather than combo decks having to rely on something like Laboratory Maniac, which was easier for the opponent to disrupt, Oracle winning the game when it enters the battlefield means that even if the Oracle dies in response, its too late
Cards that duplicate your serpent tokens are great too since your commanders activated ability requires serpents to sacrifice