Nemelex the deck builder, an idea by miek:

Idea inspired by dominion.

You have a deck, that you can build with cards. Each piety levels above * is a card you can have in your hand. ** == 1 card, ****** == 5 cards.

Ability 1 (gained at **): Add card to deck. Generates a random card and puts it at the bottom of the discard deck.

Ability 2 (also gained at **): Play a card from your hand. After playing it, you can choose to keep it in your deck, or discard it. 33% chance of being discarded even if you wanted to keep it.

Ability 3 (gained at ****): Add good card to deck. Same as Ability 1 but costs piety and more likely to be a good card.

Ability 4 (gained at ******): Add legendary card to deck. Same as ability 1 but costs a lot of piety and high chance of getting a good card.