If you don't control two or more other legendary creatures at that time, the ability won't resolve and none of its effects will happen
Even with all that considered I still really like Lynde and all the possibilities to play around with curses
Best Board Wipe Payoffs The best board wipe payoffs are conceptual
Playing The Fourth Doctor, as portrayed by Tom Baker, will allow the player to look at the top card of their library whenever they like, as well as active the Would you Like A...? ability a reference to this Doctors love of Jelly Babies which enables the player to, once per turn, play a historic land or cast a historic spell from the top of their library
Outside of mana acceleration, theres no way to cast Welcoming Vampire and trigger it on Turn 3 besides Jadar that I could find
Necropotence probably would remind players of one of the best and most notorious cards -- Yawgmoth's Bargain