Kude wrote:
I try to accomplish that... what what.. Hmm.. My main idea was to force players have more diverced decks, and not only bleed, combat, block, bounce or ally decks. Kind of toolboxing.
You can't force players to play a more diverse deck when they've already sat down to the table with a constructed deck.
Making another card that punishes specialization, like "Victim of Habit" mentioned by Dorrinal is not a bad idea. I would stay away from duplicating that effect however.
The other direction you could take is making a card that benefits a "toolbox" deck rather than hamper other decks.
How about:
"Parallel Aggression"

If this referendum is successful, each Methuselah may remove any number of cards from his or her ash heap from the game. His or her prey loses X-2 pool where X is the number of different card types removed.
"Limited Movement"
Event.
Gehenna. Do not replace until a Methuselah has been ousted.
Any minion may burn a duplicate card in his or her prey's ash heap to bleed with +1 bleed

action. Any Methuselah may take a discard action to remove any number of cards from his or her ash heap.
"Bucket List"
Unique master.
Put this card in play. When you would move a card to your ash heap, attach it to this card if there is not a card of that card type already. You may take a master phase action to burn this card and gain X pool where X is the number of cards attached to this card.
"Tool"
Master. Archtype.
Once each turn, this vampire may take an action while tapped. This vampire may not bleed and attempt a political action on the same turn.
"Tool" (alt)
Master. Archtype.
When this vampire successfully acts, you may untap this vampire by playing a reaction card that untaps a vampire or allows a vampire to act as if untapped. If this vampire is untapped at the end of your turn, he or she gains a blood.