Neither player has to pay Life Points during the Standby Phase for "Archfiend" monsters. Each time a player's "Archfiend" monster(s) is destroyed and sent to the Graveyard, except by battle, that player can add 1 "Archfiend" monster from their Deck to their hand that is a lower Level than the destroyed card.
I still hold out hope for Titan as an event duelist at some point. He's one of the more obvious candidates for a GX event opponent, especially if they have a early-series bias like they do for DM. I'd expect a Pandemonium skill (and probably an Archfiend draw sense) from him if we do, along with a couple more Archfiend monsters.
Yami Marik is one of LD with least skill. If you know what I mean, just sayin