When meeting a requirement to play a card, he is treated as such for all the effects of the card, and only them, including duration effects. He is not treated as meeting the requirements for effects the card has from being in play.

He can meet the requirements for his controller to play any card, including Master cards.

If a card he plays is canceled as it is played, he is still considered having used the requirement, if any.

Vampire traits: titles, "Red List", "Flight", non-requirements (eg. non-Red List) are vampire traits. Mortal, unlocked, ready, older, Striga, Maleficia, etc. are not.

Titles: When meeting a title requirement, he is considered a member of the underlying sect. He can meet a given generic title (eg. Prince) only once, but the controller chooses how it is met (any city, even a made-up one). He must choose a title when playing a card required a "titled" vampire (eg. Rubicon), but can only choose each title once. He can choose the non-descript "X votes" title, but only once.

If a contract chooses him when played (eg. Dirty Contract), he is "chosen for the contract" for other cards (eg. Open Dossier). If the contract choice is an effect of the card in play (eg. Clandestine Contract), he's not chosen.

Orun and Aye cards cannot be placed on him as long as he's not a Laibon.

If his capacity is above 10 when playing Call the Great Beast, he burns and it is put into play. If his capacity is less, the card is put on him with tokens equal to his capacity, but he will not be able to add counters to it later on.

You can still use the burn options of cards with a requirement he could meet when you play them, but does not meet while in play.

His ability do not let him fulfill card requirements if they are not played normally, like when using Concealed Weapon for an equipment or Piper or The Summoning for an ally.

When meeting a title requirement for a political action, the vampire does not get the title's votes for the subsequent referendum.

Can meet a sect-specific title (e.g. Justicar) requirement even if the sect does not exist anymore (eg. Fall of the Camarilla).