The trick is, because theyre all legendary, its hard to get multiple shrines on the battlefield at the same time
Thus, it contains primarily humans and deals as the name already implies with the new Coven mechanic
This includes choices about what spells to cast or what abilities to activate, as well as any decisions called for by triggered abilities or for any other reason
For example, if a 1/1 creature with lifelink deals combat damage to an opponent on your turn, they would lose 2 life, but you'd still gain only 1 life
You can return any card from your graveyard to your hand, and thats why it sees heavy play in EDH
It's way too expensive just for the card draw, though, and you'll normally play it for the rest of the effects: chapter two can fix your mana on top of giving you a big body, and Avatar Kyoshi can get you a big boost of mana