[@Scarifar]
The only issue with something like that is it relies on a card with "Archfiend" in it's name, when one of the prime and most important Archfiend cards is "Pandemonium", which also adds Archfiends to the hand.

EDIT: Decided to change the effect of Atheling to "If this card is added to your hand by the effect of "Pandemonium" or an "Archfiend" card: You can Special Summon this card." as to suit the meaning better.