I don't have all ready yet, and done no playtesting, the idea just popped into my head to try my hand at a themed miniset. The seven would be baptism, communion, confession, ordination, last rites, confirmation and marriage.
Baptism - action
Cost $4?
+3 Cards
Trash a card from your hand
Discard a card from your hand
Put a card back on your deck.
Theme: making a fresh start
Confession - action-reaction
Cost ?
+2$
--
When another player plays an attack you may set this aside. If you do, the attacker discards a silver or reveals a hand without silvers.
On your next turn, return this card to your hand.
Theme: paying for their sins. I fear this to scale poorly or be too political with several players though..
Last Rites - event
Cost ?
Trash your hand.
Okay, I admit, this one should maybe go in the really bad card ideas thread, but after sitting with a hand of Estate, Curse, Curse, Curse, Curse in an Ambassador/Seahag game, it was tempting. I'll try to make a more serious one later.