Your more disposable event, it’s the only card that is not very economically efficient. Even sacrificing a Devout Cultist, one card, and more than half a magic for +1 strength on three different attacks is still not very efficient. Having said that, this is your only tool to threaten high “surprise” damage in a turn, especially against enemy summoners. 

A nice trick as mentioned before is to sacrifice a Doom Cultist next to the opponent’s summoner or to attack with a unit and then destroy it with Death Rite allowing a ranged unit to attack through the now open position.  Overall don’t hesitate to discard this if you need magic or need to keep your hand flowing, but if you can hold it to use in a turn to focus on a high value target like an enemy champion or summoner, it may be worth its price.