Worship

Although worship is quite an expensive card which does nothing the first time it's played, when it is upgraded it is considerably more effective. By giving this card retain, you are able to enter divinity on whichever turn you see fit. When you enter divinity, the cost of the card will be refunded so this isn't too much of a problem. Furthermore, one or two copies of this card can serve all of your mantra needs. Many of the other mantra cards offer so little that you need to stack several of them in order to be able to reach divinity before the end of a fight. Even if worship is the only mantra card you have, it can still work out. It has a low rating since it is quite a slow card, but if your deck consistently benefits from damage amplification, this card can be worth it in the long run.