This card is solid. It's nothing top tier but having the ability to ready a hero at no cost other than taking up a card slot in your deck is worth noting.
There are other, flashier, and possibly more consistent forms of readying but this one is plain and simple and easy to use. Works great for multiplayer too! With some of the more recent Noldor cards like Warden of the Havens Cram can easily alter what is on top of the discard pile.