Obnoxious Billionaire

Aggravate (This creature must be blocked if able)
When Obnoxious Billionaire enters the battlefield, put a colorless artifact token called "Vault", with, "At any time, you may reveal a card from your hand, if you do, that card doesn't count towards your cards in hand". (It becomes an eighth card in your hand)
{t}: Pay X life, add {x} to your mana pool.