So far we have 3 legends proposed, a red goblin and 2 vampires.
2R Arcadidimus Reeves Legendary Creature - Goblin Assassin tap: destroy target creature with flying that was dealt damage this turn. 2/1 "They says one in a million of us Goblins is born smart. Funny, only one in a million of us Goblins even realise that. If it flaps, I'll kill it." Rare. Feredreer, Feeder of the Damned Legendary Creature - Vampire 3/3 Flying At the beginning of your upkeep, put a -1/-1 counter on all other creatures. Put a +1/+1 counter on Ferefreeder for each counter put on creatures this way. Rare 4BB DRACULA Creature - Vampire Flying, Fear, Blood (Whenever this deals damages an opponent put two +1/+1 blood counters on Dracula ) When Dracula has 3 or more blood counters he is Indestructable 5/6 Rare 3BBB Big Bad Boss Legendary Creature - Vampire Flying 4/4 Whenever a creature is put into a graveyard from play, put a +1/+1 counter on all Vampires. tap: Gain control of target Vampire ([i]This doesn't end at end of turn.[/i]) Tap an untapped Vampire you control: Target creature gets -1/-1 until end of turn.